Installation instructions GB142 - USA/CA - Buderus

7215 0200 – 10/2007 US/CA (en) For registered installers 

Installation instructions 

Condensing gas boiler 

Logamax plus GB142-24/30/45/60 

CAUTION! 

Before putting the boiler into operation read this manual carefully. 

WARNING! 

Improper installation, adjustment, alteration, service or maintenance 

can cause injury, loss of life or property damage. Refer to this manual. 

For assistance or additional information consult a qualified installer, 

service agency or the gas supplier. 

CAUTION! 

The operating manual is part of the documentation that is delivered to 

the installation's operator. Go through the information in this manual 

with the owner/operator and make sure that he or she is familiar with 

all the necessary operating instructions. 

NOTICE! 

In the Commonwealth of Massachusetts this boiler must be installed 

by a licensed Plumber or Gas Fitter. 

Warning: If the information in these instructions is not 

followed exactly, a fire or explosion may result causing 

property damage, personal injury or loss of life. 

– Do not store or use gasoline or other flammable vapors and liquids 

in the vicinity of this or any other boiler. 

– What to do if you smell gas 

• Do not try to light any boiler. 

• Do not touch any electrical switch; do not use any phone in your 

building. 

• Immediately call your gas supplier from a neighbor’s phone. 

Follow the gas supplier’s instructions. 

• If you cannot reach your gas supplier, call the fire department. 

– Installation and service must be performed by a qualified 

installer, service agency or the gas supplier. 

Please read thoroughly before installing and servicing

Preface 

About these instructions 

These Installation Instructions contain important information 

for the safe and professional installation, start-up and 

maintenance of the boiler with boiler capacities 24, 30, 45 

and 60 kW. 

These Installation Instructions are intended for professional 

installers, who have the necessary training and 

experience for working on heating and gas systems. 

Subject to technical changes! 

Slight changes may be made to the illustrations, process 

steps and technical data as a result of our policy of 

continuous improvement. 

Updating of documentation 

Please contact us if you have any suggestions for 

improvements or corrections. 

Buderus • http://www.buderus.net 

We reserve the right to make any changes due to technical modifications! 

2 Installation instructions Logamax plus GB142-24/30/45/60 • version 10/2007

Contents 

1 Safety and general instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 

1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 

1.2 Hazard definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 

1.3 The following instructions must be observed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 

1.4 Observe these instructions for space heating water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 

1.5 Tools, materials and additional equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 

1.6 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 

2 Regulations and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 

3 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 

4 Dimensions and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 

5 Packaging and transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 

5.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 

5.2 Transporting the boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 

6 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 

6.1 Requirements for the installation room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 

6.2 Fitting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 

6.3 Making the gas connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 

6.4 Fitting the heating circuit supply and return pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 

6.5 Combustion Air and Ventilation Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 

6.6 Installation of the flue gas adapter (included in the scope of delivery) . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 

6.7 Installation of the Exhaust and Air Intake system.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 

7 Connecting the condensate drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 

8 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 

8.1 External connection board connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 

9 Start-up procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 

9.1 Testing for gas leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 

9.2 Filling the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 

9.3 Filling the condensate trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 

9.4 Bleeding the gas supply valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 

9.5 Checking the combustion air/flue gas connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 

9.6 Checking the orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 

9.7 Inlet gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 

9.8 Checking and adjusting the gas/air ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 

9.9 Carrying out a leak test in operating conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 

9.10 Measuring the carbon monoxide content (CO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 

9.11 Function testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 

9.12 Measuring the ionization current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 

9.13 Testing the Ignition Safety shut off device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 

9.14 Installing the casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 

9.15 Informing the owner, handing over the technical documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 

10 BC10 basic controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 

10.1 Operating the BC10 basic controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 

10.1.1 Switching the heating system on and off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 

10.1.2 Displaying the operating conditions of the burner and resetting the burner or resetting burner faults . . . . . . 39 

10.1.3 Displaying the heating system status and/or faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 

10.2 Carrying out additional tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 

10.2.1 Carrying out a flue gas test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 

10.2.2 Selecting partial load operation (e. g. during flue gas testing). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 

10.2.3 Switching the heating system to manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 



Installation Instructions Logamax plus GB142-24/30/45/60 • version 10/2007 3

Contents 

10.3 Configuring the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 

10.3.1 Adjusting the heating capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 

10.3.2 Setting the DHW temperature value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 

10.3.3 Entering the space heating water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 

10.3.4 Setting the pump post-purge period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 

11 Shutting down the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 

11.1 Shut down the heating system using the control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 

11.2 Shutting down the heating system in the event of an emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 

12 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 

12.1 Preparing the boiler for inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 

12.2 Visual inspection for general signs of corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 

12.3 Internal leak testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.4 Measuring the ionization current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.5 Measuring the inlet gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.6 Checking and adjusting the gas/air ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.7 Carrying out a gas leak test in operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.8 Measuring the carbon monoxide content (CO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.9 Carrying out a pressure test of the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

12.10 Checking the functioning and the safety of the air intake and flue gas conduit . . . . . . . . . . . . . . . . . . . . . 48 

12.11 Checking venting systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 

13 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 

13.1 Cleaning the heat exchanger, burner and condensate trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 

13.2 Checking and adjusting the gas/air-ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 

14 Converting the boiler to propane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 

15 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 

15.1 Operating messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 

15.2 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 

15.3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 

16 Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 

16.1 Start-up report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 

16.2 Inspection report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 

16.3 Maintenance report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 

17 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 

18 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 



4 Installation Instructions Logamax plus GB142-24/30/45/60 • version 10/2007

Safety and general instructions 1 

1 Safety and general instructions 

Please observe these instructions in the interest of your 

own safety. 

1.1 Designated use 

The boiler was designed for heating water for a central 

heating system and generating domestic hot water. 

The boiler is delivered with a BC10 basic controller and 

the "Universal Automatic Burner Control Unit 3" (UBA 3) 

pre-installed. 

The boiler can be fitted with a modulating outdoor reset 

control AM10 (scope of delivery), a room controller RC10 

(optional), or an On/Off thermostat or relay panel end 

switch (accessories). 

1.2 Hazard definitions 

The following defined terms are used throughout the documentation 

to bring attention to the presence of hazards of 

various risk levels. Notices give important information 

concerning the operation of the product. 

DANGER: 

Indicates the presence of hazards that will 

cause severe personal injury, death or 

substantial property damage. 

WARNING: 

Indicates the presence of hazards that can 

cause severe personal injury, death or 

substantial property damage. 

CAUTION: 

Indicates presence of hazards that will or 

cause minor personal injury or property 

damage. 


Risk of electric shock. 

Indicates presence of hazards due to electric 

shock. 

NOTICE: 

Indicates special instructions on installation, 

operation or maintenance that are important 

but not related to personal injury or property 

damage. 

1.3 The following instructions must be 

observed 

– The boiler must only be used for its designated 

purpose, observing the Installation Instructions. 

– Only use the boiler in the combinations and with the 

accessories and spares listed. 

– Other combinations, accessories and consumables 

must only be used if they are specifically designed for 

the intended application and do not affect the system 

performance and the safety requirements. 

– Maintenance and repairs must only be carried out by 

trained professionals. 

– You must report the installation of a condensing gas 

boiler to the relevant gas utility company and have it 

approved. 

– You are only allowed to operate the condensing gas 

boiler with the combustion air/flue gas system that has 

been specifically designed and approved for this type of 

boiler. 

– Please note that local permission for the flue system 

and the condensate water connection to the public 

sewer system may be required. 

You must also observe: 

– the local building regulations stipulating the installation 

rules. 

– the local building regulations concerning the air intake 

and outlet systems and the chimney connection. 

– the regulations for the power supply connection. 

– the technical rules laid down by the gas utility company 

concerning the connection of the gas burner fitting to 

the local gas main. 

– the instructions and standards concerning the safety 

equipment for the water/space heating system. 

– the Installation Instructions for building heating 

systems. 

– The boiler must be located in an area where leakage of 

the tank or connections will not result in damage to the 

area adjacent to the boiler or to lower floors of the 

structure. When such locations cannot be avoided, it is 

recommended that a suitable drain pan, adequately 

drained, be installed under the boiler. The pan must not 

restrict combustion air flow. 

– The boiler must be installed such that the gas ignition 

system components are protected from water (dripping, 

spraying, rain etc.) during boiler operation and service. 

– The boiler must not be installed on carpeting. 

– Do not restrict or seal any air intake or outlet openings. 



Installation instructions Logamax plus GB142-24/30/45/60 • version 10/2007 5

1 

Safety and general instructions 

– If you find any defects, you must inform the owner of the 

system of the defect and the associated hazard in 

writing. 

DANGER 

if flammable gas explodes. 

Beware if you smell gas: there may be an 

explosion hazard! 

Warning: If the information in these 

instructions is not followed exactly, a fire 

or explosion may result causing property 

damage, personal injury or death. 

• Do not store or use gasoline or other flammable 

vapors and liquids in the vicinity of 

this or any other boiler. 

What to do if you smell gas 

• Do not try to light any boiler. 

• Do not touch any electrical switch; do not 

use any phone in your building. 

• Immediately call your gas supplier from 

a neighbor’s phone. Follow the gas 

supplier’s instructions. 

• If you cannot reach your gas supplier, call 

the fire department. 

Installation and service must be performed by 

a qualified installer, service agency or the gas 

supplier. 

1.4 Observe these instructions for space 

heating water 

Unsuitable heating system water can promote the formation 

of scale or sludge, which affects system efficiency. 

It can also cause corrosion and reduce life of the heat 

exchanger. 

– You must follow Buderus guidelines for boiler water 

quality. 

– Thoroughly flush the system prior to filling. 

– Use of a Buderus approved boiler cleaner is 

recommended. 

– Never use salt bedding exchangers to soften the water. 

– Do not use inhibitors or other additives unless approved 

by Buderus for that purpose! 

– When frost protection of the heating system is desired, 

only use Buderus-approved Aluminum-safe antifreeze. 

– When using oxygen-permeable pipes, e. g. for floor 

heating systems, you must separate the system using 

heat exchangers. 

– The maximum permissible flow rate of the 

GB142-24/30 this is 11 GPM (gal./min.)(= 42 l/min.), for 

the GB142-45 is 15 GPM (= 57 l/min.) and for the 

GB142-60 is 20 GPM (= 76 l/min.). 

1.5 Tools, materials and additional 

equipment 

For the installation and maintenance of the boiler you will 

need the standard tools for space heating, gas and water 

fitting. 

In addition, a handtruck with a fastening belt is useful. 

1.6 Disposal 

– Dispose of the boiler packaging in an environmentally 

sound manner. 

– Dispose of components of the heating system (e. g. 

boiler or control device), that must be replaced in an 

environmentally responsible manner. 




Regulations and guidelines 2 

2 Regulations and guidelines 

The installation must conform to the requirements of the 

authority having jurisdiction or, in the absence of such 

requirements, to the latest edition of the National Fuel Gas 

Code, ANSI Z223.1. In Canada, installation must be in 

accordance with the requirements of CAN/CSA B149.1, 

Natural Gas and Propane Installation Code. 

Where required by the authority having jurisdiction, the 

installation must conform to the Standard for Controls and 

Safety Devices for Automatically Fired Boilers, ANSI/ 

ASME CSD-1. 

Install CO detectors per local regulations. Boiler requires 

yearly maintenance, see maintenance section see 

chapter 13 "Maintenance", page 49. 

Operating Limits of the boiler: 

Max. boiler temperature: 

Max. operating pressure: 

230 °F (110 °C) 

44 psi (3 bar) 

The hot water distribution system must comply with all 

applicable codes and regulations. When replacing an 

existing boiler, it is important to check the condition of the 

entire hot water distribution system to ensure safe operation. 

Massachusetts Installations Only: 

For direct- vent boilers, mechanical-vent heating boilers or 

domestic hot water equipment, where the bottom of the 

vent terminal and the intake is installed below four feet 

above grade the following requirements must be satisfied: 

1) If there is not one already present, a carbon monoxide 

detector and alarm shall be placed in a living area 

outside the bedrooms. The carbon monoxide detector 

and alarm shall comply with NFPA 720 (2005 Edition). 

2) A carbon Monoxide detector and alarm shall be 

located in the room that houses the boiler or 

equipment and shall: 

a) Be powered by in series on the same electrical 

circuit as the boiler or equipment: 

b) Have battery back-up power: 

c) Meet ANSI/UL 2034 Standards and comply with 

NFPA 720 (2005 Edition): 

d) Have been approved and listed by a Nationally 

Recognized Testing Lab: 

3) A product-approved vent terminal must be used, and 

if applicable, a Product approved air intake must be 

used. Installation shall be in strict compliance with the 

manufacturer's instructions. A copy of the installation. 

4) A metal or plastic identification plate shall be mounted 

at the exterior of the building, four feet directly above 

the location of vent terminal. The plate shall be of 

sufficient size to be easily read from a distance of eight 

feet away, and read "Gas Vent Directly Below". 

b) For direct-vent boilers mechanical-vent heating 

boilers or domestic hot water equipment where the 

bottom of the vent terminal and the intake is 

installed four feet or above grade the following 

requirements must be satisfied: 

1) If there is not one already present, a carbon 

monoxide detector and alarm shall be placed in 

the living area outside the bedrooms, The carbon 

monoxide detector and alarm shall comply with 

NFPA 720 (2005 Edition). 

2) A carbon monoxide detector shall: 

a) Be located inn the area where the boiler or 

equipment is located: 

b) Have battery back-up power: 

c) Be a minimum comply with NFPA 720 

(2005 Edition). 

3) A product-approved vent terminal must be used, 

and if applicable, a product-approved air intake 

must be used. Installation shall be in strict 

compliance with the manufacturer's instructions. 

A copy of the installation instructions shall remain 

with the boiler or equipment at the completion of 

the installation. 




3 

Product description 

3 Product description 

6 

7 

8 

6 7 

9 

10 

11 

8 

5 

4 

12 

13 

5 

4 

9 

10 

11 

12 

3 

3 

2 

9 

2 

9 

1 14 15 16 

Fig. 1 Logamax plus GB142-24/30 (left) and GB142-45/60 (right) 

pos. 1: Drawer with control unit 

pos. 2: Universal Burner Automat (UBA3) 

pos. 3: Control unit BC10 

pos. 4: Gas valve 

pos. 5: Cover 

pos. 6: Flue measuring points 

pos. 7: Parallel flue 

pos. 8: Burner 

1 

14 

15 13 16 17 

pos. 9: Latches of which two have locks 

pos. 10: Sighting glass 

pos. 11: Heat exchanger 

pos. 12: Back cover 

pos. 13: Air intake for the fan 

pos. 14: Fan 

pos. 15: Condensate trap 

pos. 16: External Connection Board (under the cover) 

pos. 17: Pressure sensor 

2 

3 4 5 6 

100 

90 

110 

120 

130 

140 

90 

110 

130 

150 

170 

190 

1 

12 11 10 

Fig. 2 Basic Controller Logamatic BC10 

pos. 1: Main switch 

pos. 2: DHW temperature knob 1) 

pos. 3: LED "DHW status" 

pos. 4: Display 

pos. 5: Space heating water temperature knob 

pos. 6: LED "Heating system status" 

9 

8 

pos. 7: 

pos. 8: 

pos. 9: 

Under the cover a RC system controller can be installed 

LED "Burner Operation" 

Service Tool connector 

pos. 10: "Service" e button 

pos. 11: "Chimney sweep" d button 

pos. 12: "Reset" c button 

1) ECO mode means that the temperature inside the hot water tank is 140 °F (60 °C), with a hysteresis (ΔT) of 18 °F (10 °C) instead of 9 °F (5 °C) 

7 




Dimensions and connections 4 

4 Dimensions and connections 

20" (500 mm) 

4" (100 mm) 

6.2" 

(158 mm) 

4.7" (119 mm) 

22" (560 mm) 

13.2" (335 mm) 4.3" (110 mm) 

A 

B 

12" (300 mm) 

0.25" 

(6 mm) 

28" (712 mm) 

1.2" (30 mm) 7.5" (190 mm) 

3" (75 mm) 

C 

16" (420 mm) 

D E F G 

1.8" (46 mm) 

18.7" (475 mm) 

2.2" (55 mm) 

3" (75 mm) 

6" (150 mm) 

6" (150 mm) 

3" (75 mm) 

> 6" 

(150 mm) 

> 4" 

(100 mm) 

Fig. 3 Dimensions and connections for boiler GB142-24/30 (dimensions in inches) 

AA (A) = Flue gas connection (inside diameter 3'') 

LA (B) = Air intake (inside diameter 3'') 

AKO (E) = 

GAS (D) = 

Condensate water outlet, Ø 1.3” (Ø 32 mm) outside 

diameter 

Gas connection, ¾” NPT 

RK (G) 

VK (F) 

WB (C) 

= 

= 

= 

Return, Ø 1.0” 1 (Ø 25.4 mm) 

Supply, Ø 1.0” 1 (Ø 25.4 mm) 

Wall bracket 

1 One Ø 1.0” (Ø 25.4 mm) inside x 1'' NPT threaded compression fitting is delivered enclosed with boiler packaging 

NOTICE 

Observe the lateral minimum distances of the 

boiler (12” = 300 mm) and the necessary 

distances (24” (600 mm) at the front and 

4” (100 mm) at the top) for removing the casing 

and for servicing. 

Closet clearances are: 

4” (100 mm) to the right, 4” (100 mm) at the top 

and 6” (150 mm) to the left. 




4 

Dimensions and connections 

20" (500 mm) 

12" (300 mm) 

4" (100 mm) 

6.2" 

(158 mm) 

0.25" 

(6 mm) 

35.4" (900 mm) 

13.2" (335 mm) 4.3" (110 mm) 

4.7" (119 mm) A 

B 

28" (712 mm) 

1.2" (30 mm) 7.5" (190 mm) 

9.7" (246 mm) 

C 

16" (420 mm) 

D E F G 

1.8" (46 mm) 

18.7" (475 mm) 

2.2" (55 mm) 

3" (75 mm) 

20.7" (526 mm) 

3" (75 mm) 

> 6" 

(150 mm) 

> 4" 

(100 mm) 

Fig. 4 Dimensions and connections for boiler GB142-45/60 (dimensions in inches) 

AA (A) = Combustion air 

LA (B) = Air intake 

AKO (E) = 

GAS (D) = 

Condensate water outlet, Ø 1.3” (Ø 32 mm) 

Gas connection, ¾” NPT 

RK (G) 

VK (F) 

WB (C) 

= 

= 

= 

Return, Ø 1.0” 1 (Ø 25.4 mm) 

Supply, Ø 1.0” 1 (Ø 25.4 mm) 

Wall bracket 

1 

One Ø 1.0” (Ø 25.4 mm) inside x 1'' NPT threaded compression fitting is delivered enclosed. 

NOTICE 

Observe the lateral minimum distances of the 

boiler (12” = 300 mm) and the necessary 

distances (24” (600 mm) at the front and 

4” (100 mm) at the top) for removing the casing 

and for servicing. 

Closet clearances are: 

4” (100 mm) to the right, 4” (100 mm) at the top 

and 6” (150 mm) to the left. 




Packaging and transportation 5 

5 Packaging and transportation 

5.1 Scope of delivery 

The boiler is delivered fully assembled. 

• When receiving the delivery, check if the packaging is 

intact. 

• Check that all the items listed in see table 1 are included 

in the delivery. 

5.2 Transporting the boiler 

1 

9 

3 

2 

4 

CAUTION 

The boiler may be damaged when it is improperly 

secured. 

– Only transport the boiler using the right 

transportation equipment, such as a 

handtruck with a fastening belt or special 

equipment for manoeuvering steps. 

– During transportation the boiler must be 

secured on the transportation equipment to 

prevent it from falling off. 

– Protect all parts against impacts if they are to 

be transported. 

– Observe the transportation markings on the 

packaging. 

• Packaged boilers must always be lifted and carried to 

their destination by two people, or you must use a 

handtruck or special equipment to transport them to their 

destination. 

• Transport the boiler to the room where it is to be installed. 


Fig. 5 

Pos. Parts 

Items supplied with unit 

Quantity Packaging 

1 Boiler with casing 1 1 box 

2 Wall bracket 1 

3 Technical documents 1 

including: 

- User's Instructions 

- Installation Instructions 

- wall mounting template 

- Servicing Instructions 

3 

4 Compression fittings 2 

5 AM10 with outdoor sensor 1 

6 Flue gas adapter 1 

7 Propane conversion kit 1 

8 Boiler connection kit, 

including the DHW sensor 

9 GB142 Boiler manifold 

including: 

- low loss header 

- pressure relief valve 

- tridicator 

- DHW connections 

- Grundfoss 15-58 3-speed 

boiler circulator 

- supply and return shutoff ball 

valves 

Table 1 

1 

8 

6 

Items supplied with unit 

The user’s instructions (in a special format) is located in the boiler 

drawer 

1 

1 

5 

7 



6 

Installation 

6 Installation 

6.1 Requirements for the installation room 

DANGER 

– Install the heating system in a frost-free 

room. 

– Do not store any flammable materials or 

liquids in the immediate vicinity of the boiler. 

– Never use any chlorinated detergents or 

halogenated hydrocarbons (e. g. in 

spraycans, solvents and detergents, paints, 

adhesives). 

– Do not allow too much dust to collect on the 

boiler. 

6.2 Fitting the boiler 

Observe the installation clearances of the combustion air/ 

flue gas system. 

NOTICE 

– To protect the connection orifice you must 

not remove the styrofoam bottom panel. 

– Do not lift the boiler by the drawer. 

– Do not remove the transport safety clamps 

(see fig. 6) from the drawer at this time. 

– Protect the boiler and the combustion 

air/flue gas orifice against pollution during 

installation. 

• Remove the packaging materials and dispose of them. 

• Use the mounting template to mark the drill holes. 

• Install the wall bracket taking into account the necessary 

service clearances. 

• Remove the transport safety clamps (fig. 6). 

Fig. 6 

Removing the transport safety clamps 




Installation 6 

• Use the radiator key to unlock the two latches a quarter 

turn (fig. 7, pos. 1). 

• Open the latches (fig. 7, pos. 2). 

• Remove the casing by lifting it upwards and then pulling 

it forwards (fig. 7, pos. 3); do not hold the casing by the 

latches. 

• Hold the boiler by the rear boiler casing and place it on 

the wall bracket. 

3 

2 

2 

1 

• Level out the boiler. 

2 

2 

Fig. 7 

Removing the casing 

6.3 Making the gas connection 

DANGER 

Only carry out work on gas lines if you are 

licensed for such work. 

• Determine proper size gas pipe for the installation using 

see table 2 and see table 3. Do not forget the pipe fitting 

losses and observe proper size of the fittings. 

• Install the furnished ¾” gas cock on the gas connection. 

• Connect the gas pipe to the gas cock (fig. 8, pos. 1) so 

that it is free from any strain. 

1 

Fig. 8 

Making the gas connection 

NOTICE 

When installing the gas supply connection, it 

must comply with local regulations or, if such 

regulations do not exist, with the National Fuel 

Gas Code, ANSI Z 223.1. 

In Canada, the gas supply connection must 

comply with local regulations or, if such regulations 

do not exist, with CAN/CSA B149.1, 

Natural Gas and Propane Installation Code. 

A sediment trap must be provided upstream of the gas 

controls. 

Length of 

pipe (feet) 

Gas Volume Capacity 

(ft 3 / hr) 1 

¾" 1" 1 ¼" 1 ½" 

10 278 520 1,060 1,600 

20 190 350 730 1,100 

30 152 285 590 890 

40 130 245 500 760 

50 115 215 440 670 

75 93 175 360 545 

100 79 160 305 480 

150 64 120 250 380 

Table 2 Gas Pipe Capacity for different pipe sizes 

1 Maximum pipe capacity in ft 3 /hr, based on a specific gravity of 

.60 (42 mbar) and a inlet gas pressure of 14 inches W.C. 

(35 mbar) or less and a pressure drop of .3 inches W.C. (20 mbar) 




6 


Steel pipe Equivalent length for Pipe Fittings in feet 

diameter 

Type of pipe fitting 

in inches 

90°-Elbow Tee Gate valve Gas cocks 

(flow thru 

branch) 

Equivalent length in feet 

¾ 2.1 4.1 0.5 1.25 

1 2.6 5.2 0.6 1.60 

1 ¼ 3.5 6.9 0.8 2.15 

1 ½ 4.0 8.0 0.9 2.50 

Table 3 

Equivalent length for pipe fittings in feet 

6.4 Fitting the heating circuit supply and 

return pipes 

NOTICE 

– To protect the entire heating system we 

recommend installing a dirt particle filter in 

the return circuit. When retrofitting the boiler 

to an existing heating system this filter is 

required. 

– Install shut-off valves immediately before and 

after the dirt particle filter to allow the filter to 

be cleaned. 

5 

3 

1 

2 

4 

• Fit a filling and drain cock in the heating system supply 

pipe if required. 

• Also fit an adequately sized safety valve in the system 

that meets all applicable codes and regulations. 

NOTICE 

When using oxygen-permeable pipes, e. g. for 

radiant floor heating systems, you must separate 

the system using heat exchangers. 

Buderus recommends hydraulically isolating 

snowmelt systems using heat exchangers. 

• Thoroughly flush all pipes and radiators. Use of a 

Buderus approved boiler cleaner is recommended. 

• Refer to the installation template for the pipe connection 

dimensions. 

• Fit the compression fittings (fig. 9, pos. 1 and 2) first to 

the Hydronic set (see fig. 10, 11 and 12) and then to the 

boiler. 

• Connect the expansion tank to the system. 

• Connect the pipes so that they are free from strain. 

Fig. 9 Pump manifold installation 

pos. 1: Compression fitting (heating system supply pipe) 

pos. 2: Compression fitting (heating system return pipe) 

pos. 3: DHW supply 

pos. 4: DHW return 

pos. 5: Relief valve 

Connecting boiler with DHW tank 

• Connect the external hot-water tank according to the 

Installation instructions of the hot-water tank and fittings 

concerned. 





Piping examples 

The following illustrations are two Installation examples. 

NOTICE 

The following illustrations are simplified conceptual 

illustrations only. 

FLUE GAS 

GB142 

AIR INTAKE 

Piping and field components must be field verified. 

• A hot water boiler installed above radiation level or as 

required by the Authority having jurisdiction, must be 

provided with a low water cutoff device either as a part of 

the boiler or at the time of boiler installation. 

Fig. 10 is a schematic representation of fig. 9. 

NOTICE 

If this boiler is installed in a closed water supply 

system with an external indirect DHW tank, 

such as one having a backflow preventer in the 

cold water supply line, means shall be provided 

to control thermal expansion. Contact the water 

supplier or local plumbing inspector on how to 

control this situation. 

Relief valve 

The indirect DHW tank must have a temperature 

and pressure relief valve installed. The 

relief valve shall comply with the Standard for 

Relief Valves and Automatic Gas Shutoff 

Devices for Hot Water Supply Systems, ANSI 

Z21.22-CSA 4.4. 

• Install the relief valve according fig. 10. 

The relief valve must comply with following 

specifications: 

– dimensions: height 2¼ inch (57.15 mm), 

width 2 inch (50.8 mm). 

– 30 Psi (2 bar) discharge pressure. 

– discharge is ¾ inch (19.1 mm) female in 

diameter. 

1 

2 

3 

4 

Fig. 10 

pos. 1: 

pos. 2: 

pos. 3: 

pos. 4: 

pos. 5: 

pos. 6: 

PT 

pump manifold 

Schematic representation of the boiler with the 

hydronic set 

DHW supply 

drain valve 

pump manifold shut-off valves 

secondary supply 

DHW return 

secondary return 

5 

6 




6 


WARNING 

FLUE GAS 

AIR INTAKE 

No valve is to be placed between the relief valve 

and the tank. Discharge of the relief valve must 

be conducted to a suitable place for disposal 

when relief occurs and no reducing coupling or 

other restriction may be installed in the 

discharge line. 

1 

2 


Optional 

Additional 

DHW 

Tank 

Tank 

3 

4 

PT 

9 

5 

6 

7 

8 

zones 

Aditional zones 

Radiant 

Fig. 11 


hydraulic set connected to an optional hot water tank 

with one or multiple zones including one pump and 

zone valves 

pos. 1: pressure relief valve 

pos. 2: PT meter (pressure and 

temperature meter) 

pos. 3: drain valve 

pos. 4: DHW pump 

pos. 5: secondary pump 

pos. 6: shut-off valve 


pos. 8: zone valve 

pos. 9: primary pump 

NOTICE 

Primary boiler pump must have an internal 

check valve. 

FLUE GAS 


AIR INTAKE 

1 

2 

Optional 

Additional 

DHW 

Tank 

Tank 

3 

4 

PT 

8 

5 

6 

7 

zones 

Aditional zones 

Radiant 

Fig. 12 


Hydronic set connected to an optional hot water tank 

with one or multiple zones and zone pumps 

pos. 1: pressure relief valve 

pos. 2: PT meter (pressure and 

temperature meter) 

pos. 3: drain valve 

pos. 4: DHW pump 



pos. 7: zone pump 

pos. 8: primary pump 





6.5 Combustion Air and Ventilation 

Openings 

Provisions for combustion and ventilation air must be made 

in accordance with section 5.3, Air for Combustion and 

Ventilation, of the National Flue Gas Code, ANSI Z223.1, or 

Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation 

Codes, or applicable provisions of the local building codes. 


BOILER DAMAGE AND OPERATIONAL 

FAILURES ! 

Due to insufficient or lacking openings for 

combustion air and/or ventilation of the boiler 

room. 

Provisions for combustion air and ventilation are 

always required, regardless whether the 

combustion air is taken from the outside (sealed 

combustion) or inside (room air for combustion). 

Insufficient ventilation of the boiler room can 

lead to high air temperatures. This can result in 

boiler damage. 

– Make sure that intake and exhaust openings 

are sufficiently sized and no reduction or 

closure of openings takes place. 

– When the problem is not resolved, do not 

operate the boiler. 

– Please note these restrictions and its 

dangers to the operator of the boiler. 

WARNING: 

BOILER DAMAGE ! 

due to contaminated air. 

– Boiler must be clear and free from 

combustible materials, gasoline and other 

flammable vapors and liquids, and corrosive 

liquids and vapors. 

Never use chlorine and hydrocarbon 

containing chemicals (such as spray 

chemicals, solution and cleaning agents, 

paints, glues etc) in the vicinity of the boiler. 

– Do not store and use these chemicals in the 

boiler room. 

– Avoid excessive dust formation and build-up. 

NOTICE 

When one expects contaminated combustion 

air (near swimming pools, chemical cleaning 

operations and hair salons), sealed combustion 

operation is recommended. 




6 


DANGER: 

FIRE DANGER ! 

due to flammable materials or liquids. 

– Do not store flammable materials and liquids 

in the immediate vicinity of the boiler. 

All Air from Inside the Building (room air) 

The closet shall be provided with two permanent openings 

communicating directly with an additional room(s). The total 

input of all gas utilization equipment installed in the 

combined space shall be considered in making this determination. 

Each opening shall have a minimum free area of 

1 square inch per 1,000 Btu per hour of total input rating of 

all gas utilization equipment in the confined space, but no 

less than 100 square inches. One opening shall commence 

within 12 inches (305 mm) of the top, and one opening shall 

commence within 12 inches (305 mm) of the bottom of the 

enclosure. The minimum dimension of air openings shall be 

not less than 3 inches (75 mm). 

All Air from Outdoor (sealed combustion) 

The closet shall be provided with two permanent openings, 

one commencing within 12 inches (305 mm) from the top, 

and one commencing within 12 inches (305 mm) from the 

bottom of the enclosure. The openings shall communicate 

directly, or by ducts, with the outdoors or spaces (crawl or 

attic) that freely communicate with the outdoors. 

The minimum dimension of air openings shall be no less 

than 3 inches (75 mm). 

1. Where directly communicating with the outdoors, each 

opening shall have a minimum free area of 1 square 

inch per 4,000 Btu/hr of total input rating of all 

equipment in the enclosure. 

2. Where communicating with the outdoors through 

vertical ducts, each opening shall have a minimum free 

area of 1 square inch per 4,000 Btu/hr of total input 

rating of all equipment in the enclosure. 

3. Where communicating with the outdoors through 

horizontal ducts, each opening shall have a minimum 

free area of 1 square inch per 2,000 Btu/hr of total input 

rating of all equipment in the enclosure. 

4. Where ducts are used, they shall be of the same crosssectional 

area as the free area of the opening to which 

they connect. 





6.6 Installation of the flue gas adapter 

(included in the scope of delivery) 

Before installing the exhaust and air intake system, it is 

necessary to remove the transport safety device and to 

install the flue gas adapter. 

NOTICE 

The transport safety device has been installed 

to prevent unwanted movement of the heat 

exchanger during transport. 

• Remove the transport safety device with the two screws 

(see fig. 13). 

Fig. 13 

Removing the transport safety device 

• Screw on the flue gas adapter using six screws (see 

fig. 14). 

Fig. 14 

Connecting the flue gas adapter 




6 


6.7 Installation of the Exhaust and Air Intake 

system. 

NOTICE: 

Consult local and state codes pertaining to 

special building code and fire department 

requirements. Adhere to national code requirements. 

NOTICE: 

Observe the listed maximum lengths of vent 

system, which are boiler model dependent. The 

maximum permissible lengths are listed in see 

table 4, page 25. 

An optional concentric vent/air intake body (see fig. 18 and 

26) can be used for the installation of a vertical venting 

system as well as for a horizontal venting system. 

The concentric vent/air intake body can be ordered by 

Buderus Hydronic Systems, part no. BRYKGAVTO601CV. 

Other optional vent kits are: 

383-500-397 Plastic Vent Kit 

PAZ1900019 V1000 Aluminum Vent Kit. 

The boiler can also be operated with separate air intake and 

exhaust piping (see fig. 19 and fig. 26). 

The termination shall be at least 4 ft (1,220 mm) for the U.S. 

and 6ft. (1,830 mm) for Canada away from a gas utility 

meter, service regulator or the like (for room air applications 

only). 

The termination shall terminate at least 4 ft (1,220 mm) 

below, 4 ft (1,220 mm) horizontally from, or 1 ft (305 mm) 

above any door, window, or gravity air inlet into any building. 

Vent must be at least 12 inches (305 mm) above grade, 

anticipated snow line or roof surface (Canada 18” (457 mm) 

minimum) (see fig. 16). 

Vent termination must be at least 7 ft (2,135 mm) above 

a public walkway (see fig. 17). 

Vent must be 3 ft (915 mm)above any forced air intake 

within 10 ft (3,050 mm) (see fig. 17). 

Do not extend exposed vent pipe outside the building 

beyond recommended distance. Condensate could freeze 

and block vent pipe. 

Vent should terminate at least 3 ft (915 mm) away from adjacent 

walls, inside corners and 5ft (1525 mm) below roof 

overhang (see fig. 17). 

It is not recommended to terminate vent above any door or 

window, condensate can freeze causing ice formations. 

Do not use chimney as a raceway if another boiler or fireplace 

is vented into or through chimney. 

2 

Fig. 15 

Vent pipes 

1 





All vent pipes must be glued, except for the flue gas adapter 

(fig. 15, pos. 1) which is screwed into place and the first 

connection to the flue gas adapter (fig. 15, pos. 2). Installed 

you can slide the pipe onto the adapter, properly supported 

and the exhaust pipe must be pitched a minimum of a ¼ inch 

per foot back to the boiler. This allows the condensate to 

drain away. 

All combustion air and vent pipe materials and fittings must 

comply with the following: 

Item Material United states Canada 

PVC schedule 40 

ANSI/ASTM D1785 

Vent or air pipe 

and fitting 

PVC-DWV 

CPVC schedule 40 

ABS-DWV schedule 40 

PVC 


ANSI/ASTM F441 



CSA or BH Gas 

venting systems, ULC S636 * 

certified only 

Pipe cement/primer 

CPVC 

ANSI/ASTM F493 

ABS 


* Components of the certified vent systems must not be interchanged with other vent systems or unlisted pipe fittings Plastic components, and specified 

primers and glues of the certified vent system must be from a single system manufacturer and not intermixed with other system manufacturer's vent 

system parts. 

NOTICE 

Do not use cellular core pipe. 

NOTICE 

Ensure that a condensate drain is always 

installed at the exhaust connection see 

chapter "7 Connecting the condensate drain" 

on page 26 

NOTICE 

A minimum clearance of 4 feet horizontally from 

and in no case above and below, unless a 4-foot 

horizontal distance is maintained, from electric 

meters, gas meters, regulators and relief equipment 

Fig. 16 

12" (300 mm) 

minimum 

12" (300 mm) 

minimum 

EXHAUST 

12" (300 mm) 

minimum 

INTAKE 

12" (300 mm) 

minimum 

12" (300 mm) 

minimum 

Vent and air pipe position (1) of a sealed combustion 

system 




6 


5' 

(1525 mm) 

7' 

(2135 mm) 

1' 

(305 mm) 

4' 

(1220 mm) 

4' 

(305 mm) 

4' 

(1220 mm) 

(1220 mm) 

1' 

3' 

3' 

(915 mm) 

(1220 mm) 

Forced 

Air Inlet 

3' 

(915 mm) 

(305 mm) 

1' 

at least 1 ft (305 mm) 

above grade and snow line 

Exhaust terminal must be at least 3 ft (915 mm) 

above forced air inlet within 10 ft (3050 mm) 

Gravity Air Inlet 

Fig. 17 

Vent and air pipe position (2) of a system with combustion air supply from the room (non-room sealed) 

Below are approved examples of vertical and horizontal 

venting installation 

10"- 0" MIN 

(250 mm - 0 mm MIN) 

NOTICE 

Place pipe supports every 5 feet (1525 mm) of 

horizontal run, beginning with support near 

boiler. 

12" (300 mm) OVER MAXIMUM 

SNOW LEVEL OR 24" (600 mm) 

WHICHEVER IS 

GREATER 

INTAKE 

1 

NOTICE 

The condensate water must be drained in 

accordance with the applicable rules. See 

chapter 7 „Connecting the condensate drain“. 

EXHAUST 

3" (80 mm) 

3" (80 mm) 

NOTICE 

Periodic cleaning of the vent terminal and 

air-intake screens is mandatory. 

Fig. 18 

Vertical venting system (sealed combustion) 





10"- 0" MIN 

(250 mm - 0 mm MIN) 

12" (300 mm) OVER 

MAXIMUM SNOW LEVEL 

OR 24" (600 mm) 

WHICHEVER IS 

GREATER 

3" (80 mm) 

EXHAUST 

INTAKE 

3" (80 mm) 

EXHAUST 

INTAKE 

3" (80 mm) 

Fig. 20 

Vertical parallel venting system (sealed 

combustion) - Situation 1 

Fig. 19 Horizontal venting system (room air only) - 

Situation 1 

10"- 0" MIN 

(250 mm - 0 mm MIN) 

12" (300 mm) OVER 

MAXIMUM SNOW LEVEL 

OR 24" (600 mm) 

WHICHEVER IS 

GREATER 

INTAKE 

3" (80 mm) 

EXHAUST 

INTAKE 

EXHAUST 

3" (80 mm) 

3" (80 mm) 

Fig. 22 

Vertical parallel venting system (sealed 

combustion) - Situation 2 

Fig. 21 Horizontal venting system (sealed combustion) - 

Situation 2 




6 


10"- 0" MIN 

(250 mm - 0 mm MIN) 



WHICHEVER IS 

GREATER 

EXHAUST 

12" (300 mm) 

12" minimum 12" 

(300 mm) (300 mm) 

minimum minimum 

INTAKE 

12" 

(300 mm) 

minimum 

3" (80 mm) 

INTAKE 

min. 12" 

3" (80 mm) 

12" 

(300 mm) 

minimum 

3" (80 mm) 

EXHAUST 

Fig. 24 

Vertical venting system (room air only) 

Fig. 23 

Horizontal parallel venting system (sealed 

combustion) 

INTAKE 

10"- 0" MIN 

(250 mm - 0 mm MIN) 

3" (80 mm) 

EXHAUST 

3" (80 mm) 



WHICHEVER IS 

GREATER 

EXHAUST 

INTAKE 

3" (80 mm) 

3" (80 mm) 

Fig. 26 

Horizontal venting system (sealed combustion) 

Fig. 25 

Vertical exhaust and horizontal intake venting system 

(sealed combustion) 





Do not exceed the total equivalent venting length of 100 feet 

(30,480 mm) (GB142-24/30/45) and 60 feet (18,288 mm) 

(GB142-60) maximum requirement each for the intake and 

exhaust piping. 

See table 4 for the Friction Loss Equivalent in piping and 

fittings. 

Example: 

When you end up using 3 x 45°-elbows and the concentric 

vent kit, then the total venting length may not exceed 88 feet 

(26.82 m) (GB142-24/30/45) or 48 feet (14.63 m) 

(GB142-60). 

3 x 45°-elbow = 3 x 3 ft (0.91 m) = 9 ft (2.73 m) 

concentric vent kit = 3 ft (0.91 m) 

Fittings or Piping 

Equivalent 

feet 

m 

45 degree elbow 3 0.91 

90 degree elbow 5 1.52 

plastic pipe per foot 1 0.30 

concentric vent kit 3 0.91 

Table 4 Friction Loss Equivalent in piping and fittings 

Total friction loss equivalent = 12 ft (3.66 m) 

Total venting length for this example is: 

GB142-24/30/45 = 100 ft (30.48 m) - 12 ft (3.66 m) = 

88 feet (26.82 m) 

GB142-60 = 60 ft (18.29 m) - 12 ft (3.66 m) = 

48 feet (14.63 m). 

NOTICE 

The minimum covering wall thickness is 

1" (25 mm). 

The maximum covering wall thickness is 

16" (406 mm). 

CAUTION ! 

Vent connectors serving appliances vented by 

natural draft shall not be connected into any 

portion of mechanical draft systems operating 

under positive pressure. 

NOTICE 

For Direct venting properly reassemble and 

reseal the vent and air-intake systems. 




7 

Connecting the condensate drain 

7 Connecting the condensate drain 

NOTICE 

The condensate must be drained from the boiler 

and from the flue in accordance with the applicable 

rules and regulations. 

No condensate drain is integrated into the boiler. It is 

required to install the furnished 3” x ¾” drain tee as an 

external condensate drain. See fig. 27. Install this drain tee 

as close as possible to the boiler exhaust connection. 

NOTICE 

Use materials approved by the authority having 

jurisdiction. In the absence of such authority, 

PVC and CPVC pipe must comply with ASTM 

D1785, F441 or D2665. Cement and primer 

must comply with ASTM D2564 or F493. 

For Canada, use CSA or ULC certified PVC or 

CPVC pipe, fittings and cement. 

EXHAUST 

3" (80 mm) 

INTAKE 

If the condensate outlet of the boiler is lower than the drain, 

a condensate pump must be used. 

The condensate produced by the boiler has a pH value 

between 3 and 4. 

Install a neutralization unit if required by the local code. 

Fig. 27 

Condensate drain 




Electrical connections 8 

8 Electrical connections 

Devices such as pumps, outdoor sensor and 3-way valve 

are all connected to the external connection board. 

The electrical connections to the boiler must be made in 

accordance with all applicable local codes and the latest 

revision of the National Electrical Code, ANSI/NFPA-70 

Installations should also conform with CSA C22. 

1 Canadian Electrical Code Part 1 if installed in Canada. 

8.1 External connection board connections 

Make all electrical connections inside the external connection 

box. 

• Remove the cover of the external connection box 

(fig. 28). 

Connecting incoming power 

The boiler must be electrically grounded in 

accordance with local codes, or in absence of 

local codes, with the National Electrical Code, 

ANSI/INFPA 70 and/or the CSA C22.1, Electrical 

Code. 

Fig. 28 

Removing the cover from the external connection box 

• Install a 120V cable to the boiler (see fig. 29, pos. 1). 

• Lead the cable through the cable guide (see fig. 29, 

pos. 2). 

Terminals 1 – 6 (fig. 30) are low-voltage connections and 

terminals 7 – 10 (fig. 30) are 120 Volt connections. 


RISK OF ELECTRIC SHOCK. 

Once the main power supply is on then there is 

120V on terminals 7 – 10 (can only be used with 

the correct configuration of the control unit and 

specific system hydraulics), if the main switch of 

the BC10 basic controller is switched on. 

RC terminal 

Connector for installation of an RC controller for indoor reset 

operation or a module like the AM10. 

FA terminal 

This is the terminal where you connect the outdoor temperature 

sensor. Only necessary for outdoor weather responsive 

operation. 

WA terminal 

For connection of a potential free thermostat or relay panel 

end switch. 

FW 

Connection for an external DHW tank sensor 

Fig. 29 

FA 

RC 

Fig. 30 

external connection board 

Connections to external connection board 

2 

FW 

WA EV DWV PK PS PZ Netz 

1 2 3 4 5 6 7 8 9 10 

Abbr. Color Component 

RC orange RC room controller connection or for an 

AM10 or other module 

FA blue Outdoor-temperature sensor 

WA green Potential-free On/Off thermostat 

FW gray DHW temperature sensor 

EV red External switching contact, potential-free 

for floor heating safety etc. 

DWV green Connection for external 3-way valve 

PK green Primary loop pump 120V 60Hz 

PS gray DHW tank pump 120V 60Hz 

PZ lilac DHW recirculating pump 120V 60Hz 

Netz white Main power connection 120V 60Hz 

1 




8 

Electrical connections 

EV terminal (external switching contact) 

This terminal can be used for example for the safety switch 

of floor heating. This protects the floor heating against too 

high boiler water temperatures (external manual reset high 

limit). The boiler is shut down when the external switching 

contact is opened. 

The normally closed contacts of a LWCO will shut down 

burner operation but allow the pump to continue to operate 

in case of a low water condition. 

DWV 

Terminal for connection of an external 3-way valve. 

PK 

Connector for the primary loop pump 120V 60Hz. 

PS 

Connector for the DHW tank pump 120V 60Hz. 

PZ 

Connector for the DHW recirculating pump 120V 60Hz. 

Netz 

Main power connector 120V 60Hz. 

120-volt connections 


Make sure that the power consumption of each 

of the terminals 7 – 9 (see circuit diagram) does 

not exceed 250 W or 5 Amp. 




1 

4 

5 

Electrical connections 8 


Label all wires prior to disconnection when servicing. 

Wiring errors can cause improper and dangerous operation. 

Verify proper operation after servicing. 

Earth 

120 VAC 

Function module 

Operating switch 

Mains supply 

120 VAC 60 Hz 

L 

L 

white 

N 

N 

Grid 

High Voltage 

PE 

Circulating pump 

120 VAC, max. 250 VA 

lilac 

L N PE 

14 13 

PZ 

DHW circulator 

120 VAC, max. 250 VA 

L 

grey 

N 

PE 

Boiler circulator 

120 VAC, max. 250 VA 

green 

25 24 63 61 

PS 

PK 

L 

N 

PE 

External 3-way valve 

External switch contact 

Potential-free e.g. 

for floor heating 

DHW sensor 

On/Off temperature 

control, potential-free 

Outdoor-temperature 

sensor 

Modulating room controller 

green 

white red grey blue orange 

2 2 1 2 1 2 1 2 1 

1 3 2 1 

DWV EV FW WA FA RC 

BC10 connector 

Bus 


External connection for specialist servicing company 

8 7 6 5 4 3 2 1 

3 

2 

1 

1 

2 

3 

4 

2 

4 

3 

1 

5 

4 

3 

2 

1 

17 

16 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

1 

5 

4 

3 

2 

6 5 

4 

3 

2 

1 

8 

16 

15 

1 

15 

16 

13 

1 

54 

51 

46 

19 

23 

79 

53 

77 

26 

63 

64 

75 

74 

36 

37 

58 

57 

33 

60 

35 

8 

43 

34 

58 

57 

1 

2 

6 5 

4 

3 

2 

1 

16-pole connector 

(120 VAC) 

120 VAC 


L 

N 

L 

PE 

N 

6 

5 

3 

7 

4 

10 

11 

9 

120 VAC 

120 VAC 

120 VAC 

120 VAC 

Connection box UBA 3.0 


Pin 16 Pin 1 

2 3 

1 2 3 

1 2 

N PE L 

N 120 L 

VAC 

KIM 

M 

55 Pin 81 

28 

Pin 1 

Hot 

surface 

ignitor 

Gas burner 

fitting Transformer 

Fan unit 

6 7 

5 1 2 3 4 

1 2 3 4 5 

1 


Earth 

Supply sensor 

Safety-temperature sensor 

Return sensor 

P 

Pressure 

sensor 

Ionization 

3 2 1 

230 VAC 

230 VAC 

10 VAC 

10 VAC 

24 VAC 

0 VAC 

24 VRAC 

24 VRAC 

24 

22 

14 

13 

39 

38 

12 

11 

70 

61 

62 

2 

55 

1 

28 

90 

81 

25 

52 

27 

23 

79 

53 

76 

49 

16 

44 

17 

45 


(AC 0, 10, 24 and 120 V) 

PE 

N 

L 

14 

12 

13 

69 

68 

67 

Fig. 31 

Electric circuit diagram 




9 

Start-up procedure 

9 Start-up procedure 

There are several steps involved in starting up the boiler. 

FOR YOUR SAFETY READ BEFORE OPERATING 

WARNING: If you do not follow these instructions 

exactly, a fire or explosion may result causing 

property damage, personal injury or loss of life. 

A. 

B. 

C. 

D. 

This appliance does not have a pilot. It is equipped with an ignition device 

which automatically lights the burner. Do not try to light the burner by hand, 

BEFORE OPERATING smell all around the appliance area for gas. Be sure to 

smell next to the floor because some gas is heavier than air and will settle on 

the floor. 

WHAT TO DO IF YOU SMELL GAS 

• Do not try to light any appliance. 

• Do not touch any electric switch; do not 

use any phone in your building. 

• Immediately call your gas supplier from a neighbor's phone. Follow the gas 

supplier's instruction. 

• If you cannot reach your gas supplier, call the fire department. 

Use only your hand to push in or turn the gas control knob. Never use tools. 

If the knob will not push in or turn by hand, don't try to repair it, call a qualified 

service technician. Force or attempted repair may result in a fire or explosion. 

Do not use this appliance if any parts have been under water. Immediately call a 

qualified service technician to inspect the appliance and to replace any part of 

the control system and any gas control which has been under water. 

OPERATING INSTRUCTION 

1. STOP! read the safety information above on this label. 

2. Turn off all electric power to the appliance. 

3. Set the thermostat or other operating control to lowest setting. 

4. This appliance is equipped with an ignition device which 

automatically lights the burner. Do not try to light the burner by hand. 

5. Close main gas shut off valve. 

6. Wait (5) minutes to clear out any gas. Then smell for gas. Including near the 

floor. If you smell gas, STOP! Follow "B" in the safety information above on 

this label. If you don't smell gas, go to the next step. 

7. Open main shut off valve. 

8. Set the thermostat or other operation control to desired setting. 

9. Turn on all electric power to the appliance. 

10. If the appliance will not operate, follow the instruction "To Turn Off Gas To 

Appliance" and call your service technician or gas supplier. 

TO TURN OFF GAS TO APPLIANCE 

1. Turn off all electric power to the appliance if service is to be performed. 

2. Set the thermostat or other operating control to lowest setting. 

3. Close main gas shut off valve. 708.375A - 2172B 




Start-up procedure 9 

9.1 Testing for gas leaks 

Prior to start-up of the boiler you must check the external 

tightness of the gas supply valve and confirm this in the 

start-up report. 

WARNING 

– Cover endangered positions before leak 

testing. 

– Do not spray the leak testing agent onto 

cables, plugs or electrical connection lines. 

Do not allow it to drip onto them either. 

DANGER 

Leaks may be caused to pipes and screw 

connections during commissioning and maintenance 

activities. 

– Carry out a proper leak test. 

– Only use approved leak detection agents for 

leak detection. 

• Disconnect the heating system from the power supply. 

• Check the exterior tightness of new conduit sections up 

to and including the direct sealing point on the gas burner 

fitting. The maximum test pressure allowed on the input 

of the gas burner fitting is 14 inch W.C. (35 mbar). 

9.2 Filling the boiler 

Set the main switch to "1". P0.0 appears in the display of the 

BC10 telling you that there is no system pressure. 

• Fill the heating system to a pressure of around 20 psi 

(1.5 bar). 

NOTICE 

Observe the space heating water requirements 

as described in paragraph 1.4 on page 6. 

• Observe the pressure on the BC10 or the P/T gauge in 

the pump manifold for the heating circuit. The fill pressure 

of the system should be at least the required inlet 

pressure for the expansion tank plus 7.2 psi (0.5 bar). 

The minimum pressure is 15 psi (1.0 bar) (on a cold 

system). The maximum pressure is 44 psi (3.0 bar) (if the 

heating medium temperature is at its highest possible 

level). If this pressure is exceeded, the pressure relief 

valve will open. 

NOTICE 

If a relief valve discharges periodically, this may 

be due to thermal expansion in a closed water 

supply system. Contact the water supplier or 

local plumbing inspector on how to correct the 

situation. Never plug the relief valve. 




9 


For first time start up it is necessary to set the DHW temperature 

knob and the space heating water temperature knob 

to the desired setting (see subsection 10.3.2 and 10.3.3). 

Factory setting is "0". 

100 

90 

110 

120 

130 

140 

90 

110 

130 

150 

170 

190 

WARNING 

There is a hot water scald potential if the BC10 

is set too high. 

9.3 Filling the condensate trap 

• Make sure that you fill the condensate trap with water. 

This is to prevent exhaust gases from entering the room. 

• Remove the condensate trap (see fig. 32). 

• Fill with water and refit the condensate trap in reverse 

order. 

Fig. 32 

Filling water into the condensate trap 

9.4 Bleeding the gas supply valve 

• Loosen the screw plug on the testing nipple for the gas 

connection and venting (fig. 33, pos. 1) by two turns and 

fit a hose. 

• Slowly open the gas shut-off valve. 

• Run the gas that is discharged through a water bath. 

• Close the gas shut-off valve when no more air is 

released. 

• Remove the hose and tighten the screw plug again. 

1 

9.5 Checking the combustion air/flue gas 

connection 

Check the following points: 

– Is the prescribed combustion air/flue system used 

– Have the instructions for configuring the flue system as 

specified in the relevant Installation instruction for the flue 

gas system been observed 

Fig. 33 

Bleeding the gas supply conduit 





9.6 Checking the orifices 


The burner must only be commissioned if the 

correct orifices are fitted (see table 6). 

• Convert the burner fitting to another gas type 

if required (see chapter 14 "Converting the 

boiler to propane", page 52). 

9.7 Inlet gas pressure 

• Open at least one thermostatic radiator valve if present 

to allow water to flow through the boiler. 

Do not switch on the boiler. 

• Close the gas shut-off valve. Loosen the screw plug on 

the inlet gas pressure testing nipple by two turns (fig. 34, 

pos. 1). 

• Connect the pressure gauge connection hose to the 

testing nipple (fig. 34, pos. 2). 

• Slowly open the gas shut-off valve. 

The boiler and its individual shutoff valve must be disconnected 

from the gas supply piping system during any pressure 

testing of that system at test pressures in excess of 

½ psi (3.5 kPa). 

The boiler must be isolated from the gas supply piping 

system by closing its individual manual shutoff valve during 

any pressure testing of the gas supply piping system at test 

pressures equal to or less than ½ psi (3.5 kPa). 

Table 6 

Boiler 

capacity 

Type of gas 

supply 

Gas orifice diameter 

in mm (inch) 

24 kW Natural gas 4.45 (0.174) 

LPG P 3.35 (0.131) 

30 kW Natural gas 4.45 (0.174) 

LPG P 3.35 (0.131) 

45 kW Natural gas 5.40 (0.213) 

LPG P 4.05 (0.158) 

60 kW Natural gas 7.50 (0.293) 

LPG P 5.40 (0.213) 


Fig. 34 

Measuring the inlet gas pressure 

• Briefly press on the control panel cover to open it. 

Fig. 35 

Opening the control panel 

• Switch on the heating system by setting the main switch 

to position "1" (see chapter 10 "BC10 basic controller", 

page 39). 

• Press the "Chimney Sweep" d button and hold it (for 

approx. two seconds) until the display shows a decimal 

point. 




9 


• Measure the gas connection pressure as soon as the 

"Burner" LED lights and enter this value in the start-up 

report. 

The inlet gas pressure must be: 

– for natural gas - min. 3.5 to 10.5 inch W.C (8.7 to 

26.1 mbar), nominal supply pressure 7.0 inch W.C. 

(17,4 mbar) 

– for LPG - min. 8.0 to 13.0 inch W.C. (19.9 to 32.3 mbar), 

nominal supply pressure 11.0 inch W.C. (27.4 mbar). 

• Repeatedly press the "Service" e button until the 

temperature indication is displayed. 

• Press the "Chimney Sweep" d button to end the 

measurement procedure. 

• Close the gas shut-off valve. 

• Remove the connection hose again and tighten the 

screw plug on the testing nipple. 

• Open the gas shut-off valve again. 


– Contact the relevant gas utility company if the 

required inlet gas pressure is not available. 

– Install a gas pressure regulator before the 

gas burner fitting if the supply pressure is too 

high. 

9.8 Checking and adjusting the gas/air ratio 

• Switch off the heating system using the main switch. 

• Loosen the screw plug on the measuring nipple for the 

burner pressure by two rotations (fig. 36, pos. 1). 

• Set the pressure gauge to zero. 

• Use a hose to connect the plus terminal of the pressure 

gauge to the burner pressure measuring nipple (fig. 36, 

pos. 2). 

1 

2 

Fig. 36 

Checking the gas/air ratio 

• Switch on the heating system using the main switch. 






approx. two seconds) until the display shows the decimal 

point. 

• Press and hold the "Chimney Sweep" d and "Service" 

e buttons (for approx. five seconds) until the display 

shows "Lxx" (e. g. L80). 

• Set the boiler to partial load "L30" by pressing the 

"Chimney Sweep" d button (higher values) or the 

"Reset" c button (lower values). 

• Read out the differential pressure. 

The differential pressure (p Gas – p Air ) must be -0.02 inch 

W.C. (- 5 Pa) (±0.02 inch W.C. = ± 5 Pa) (read-out on 

pressure gauge: -0.04 – 0 inch W.C. = -10 – 0 Pa). 

• Enter the value measured in the start-up report. 

• If the gas/air ratio is not correct it can be adjusted using 

the adjustment screw (fig. 37, pos. 1). The adjustment 

screw is located behind the cover screw. 

+ 

= higher values = lower values 

Fig. 37 

Setting the gas/air ratio 

• Repeatedly press the "Service" e button until the 


• Press the "Chimney Sweep" d button until the decimal 

point is cleared from the display. 


• Remove the measurement set-up, tighten the screw in 

the burner pressure measuring nipple. 





9 


9.9 Carrying out a leak test in operating 

conditions 

• Check all gaskets and joints in the burner gas circuit for 

leaks while the burner is operational, using a foaming 

agent. 

DANGER 

Leaks may be caused to pipes and screw 

connections during start-up activities if flammable 

gas explodes. 

– Only use approved leak detection agents for 

leak detection such as a soapy water 

solution. 


due to a short circuit. 

– Cover damageable parts before leak testing. 

– Do not spray the leak testing agent onto 

cables, plugs or electrical connection lines. 

Do not allow it to drip onto them either. 

9.10 Measuring the carbon monoxide content 

(CO) 

• Measure the carbon monoxide content on the flue gas 

sampling point (fig. 38). 

The CO values in an air-free condition must be below 

400 ppm or 0.04 vol. %. 

Values of 400 ppm and up indicate that the burner adjustment 

may be wrong, the gas burner fitting or the heat 

exchanger are dirty or that there may be burner faults. 

• You must establish and resolve the cause. The boiler 

must be operational when you do this. 

9.11 Function testing 

• You must check the functioning and, if readjustment is 

possible, the adjustment of all control, regulating and 

safety devices when carrying out start-up tests, annual 

inspections or maintenance as required. 

• You must also test the gas and water lines for leaks. 

Fig. 38 

Flue gas sampling point 





9.12 Measuring the ionization current 


• Disconnect the plug and socket connection of the monitoring 

cable and connect the measuring device in series 

(fig. 39). Select the µA direct current range on the 

measuring device. The measuring device must have 

a resolution of at least 1 µA. 

Fig. 39 

Measuring the ionization current 



approx. two seconds), until the display shows the 

decimal point. 


e buttons, until the display shows "Lxx" (e. g. L80). 

• Set the boiler to partial load "L30" by pressing the 

"Chimney Sweep" d button (higher values) or the 

"Reset" c button (lower values). 

• Measure the ionization current. When the boiler is in 

partial load mode the ionization current must be > 5 µA 

DC. 

• Enter the value measured in the start-up report. 

• Repeatedly press the "Service" e button, until the 


+ 

= higher values = lower values 

• Press the "Chimney Sweep" d button to end the 

measurement procedure. 


• Remove the measuring device and restore the plug and 

socket connection. 

• Switch on the heating system again using the main 

switch. 




9 


• Push against the drawer (fig. 40) to close the control 

panel. 

9.13 Testing the Ignition Safety shut off 

device 


• Disconnect the plug and socket connection of the monitoring 

cable. 



approx. two seconds), until the display shows the 

decimal point. 

• Check if the boiler does one start-up attempt and three 

restart attampts. 

After each start-up attempt the boiler will signal a start-up 

failure. A "6A" code can be seen in the display. 

After the last start-up attempt, the boiler will lock out. The 

"6A" code is blinking in the display. 

• Connect the plug and socket connection of the monitoring 

cable. 

• Press the reset button. 

• Check if the boiler starts-up. 

• Press the "Chimney Sweep" button return to normal 

operating conditions. 

Fig. 40 

Closing the control panel 

9.14 Installing the casing 

• Install the casing and close the latches (fig. 41). 

Do not lift the casing by the latches! 

• Lock the latches using the radiator key. 

9.15 Informing the owner, handing over the 

technical documents 

• Show the owner how the heating system works and how 

the boiler can be operated. Hand over the technical 

documents. 

Fig. 41 

Installing the casing 




BC10 basic controller 10 

10 BC10 basic controller 

10.1 Operating the BC10 basic controller 

2 

3 4 

5 6 

100 

110 

120 

90 

110 

130 

150 

90 

130 

140 

170 

190 

1 

12 11 10 

9 

8 

7 

Fig. 42 BC10 basic controller – Controls 

pos. 1: Main switch 

pos. 2: DHW temperature knob 

pos. 3: LED "DHW status" 

pos. 4: Display 

pos. 5: Space heating water temperature knob 

pos. 6: LED "Heating system status" 

pos. 7: 

pos. 8: 

pos. 9: 

Under the cover a RC system controller can be installed 

(not available). 

LED "Burner Operation" 

Service Tool connector 

pos. 10: "Service" e button 

pos. 11: "Chimney sweep" d button 

pos. 12: "Reset" c button 

10.1.1 Switching the heating system on and off 

Switching on the heating system 

• Set the main switch on the BC10 basic controller to 

position "1" (On). 

Switching off the heating system 

• Set the main switch on the BC10 basic controller to 

position "0" (Off). 

10.1.2 Displaying the operating conditions of the 

burner and resetting the burner or resetting 

burner faults 

Displaying the operating conditions of the burner 

The LED indicates the operating condition of the burner. 

LED Condition Explanation 

On Burner The water in the boiler is being heated. 

operational 

Off Burner off The water in the boiler has reached the 

required temperature or there is no heat 

request. 

Table 7 

LED indication 




10 

BC10 basic controller 

Resetting the boiler or resetting faults 

If the boiler is down due to a fault, you can reset the boiler 

by pressing the "Reset" c button. This is only possible for 

so-called lock-out faults. There is another type of fault, socalled 

blocking faults, that reset themselves when the cause 

has been remedied. 

• Press the "Reset" c button to reset the boiler. 

The display shows "rE" while resetting. 

It is only possible to reset the boiler when a lock-out code 

(blinking fault code) is visible in the display. 

rE 

NOTICE 

If the burner returns to fault mode after resetting 

the boiler, you must resolve the fault using the 

servicing section in this document. 

Contact your supplier if necessary. 

10.1.3 Displaying the heating system status and/or 

faults 

The display of the BC10 basic controller shows the status of 

the heating system. 

In the event of a fault the display immediately shows the fault 

or the warning in the form of an error code (see 

subsection 15.2). The status display will flash if the fault is a 

lock-out fault. 

• Press the "Service" e button to switch between status 

displays or to read out the service and error codes. 

• Resolve the fault see subsection 15.3. 

The following status displays can be seen depending on the 

operating conditions: 

Displays 

(examples) 

Values Meaning Operating condition/Remedy 

140 

1) 

P21 

-H 

number 0 ... 199 2) Current boiler water temperature (in °F) 

> P15 Current system pressure (in psi) Normal operating conditions 

Table 8 Possible status displays 

1) Standard display for this operating condition. This display appears after 5 minutes if no button is pressed. 

2) 

The temperature is higher as 199° when 199 is blinking in the display. 





Displays 

(examples) 

Values Meaning Operating condition/Remedy 

P12 

H 7 

1) 

(changing) 

-H 

140 

P12 

P3 ... P12 

number 0 ... 199 2) 

P3 ... P12 

Warning: 

System pressure is too low (between 3 and 12 psi 

= 0.2 and 0.8 bar) 

Current boiler water temperature (in °F) 

Current system pressure (in psi) 

Warning 

Heating system remains operational 

between 12 psi and 3 psi (0.8 and 0.2 bar). 

Fill the heating system and restore the 

minimum filling pressure (≥ 14.5 psi = 

≥ 1.0 bar). 

The system pressure is shown for 

10 minutes after which the standard 

display returns. 

P3 

1) 

(flashing) 

207 

140 

P3 

< P3 Fault: system pressure is far too low (< 3 psi = 

< 0.2 bar) 

number > 200 

number 0 ... 199 2) 

Error code 

Remedy the error see servicing section 


< P3 Current system pressure (in psi) 

Fault 

Burner and boiler circuit pump are not 

operational. Frost protection is active up to 

2 psi (0.1 bar). 

The heating system will only become 

operational again if the pressure is back to 

14.5 psi (1.0 bar). 

Fill the heating system and restore the 

minimum filling pressure (≥ 14.5 psi = 

≥ 1.0 bar). 

The system pressure is shown for 

10 minutes after which the standard 

display returns. 

3A 

A12 

- 

1) (partially 

flashing) 

207 

140 

P21 

Combination of 

letters and digits 

number > 199 

number 0 ... 199 2) 

Service code 

Error code 

Remedy the error using the servicing section in 

this manual 


> P15 Current system pressure (in psi) 

1) 

A00 ... A99 Service code System faults 

816 

-H 

140 

P21 

(flashing) 

number > 800 

number 0 ... 199 

Error code 

Remedy the error using the service section in this 

manual 


> P15 Current system pressure (in psi) 

Fault 

No communication between BC10 and automatic 

gas burner. 

Fault 

Lock-out faults (flashing display) must be 

reset by pressing the "Reset" c button. 

Blocking faults reset automatically as soon 

as the cause has been removed. 

Remedy any blocking faults that remain 

active for a long time using the service 

section in this manual. 

System faults are faults in the heating 

system that do not affect the burner 

operation. 

Fault 

Remedy the error using the service section 

in this manual. 

Check the connections to both devices. 

Check the communication lines. 

Table 8 

Possible status displays 

1) Standard display for this operating condition. This display appears after 5 minutes if no button is pressed. 

2) 

The temperature is higher as 199° when 199 is blinking in the display. 




10 


10.2 Carrying out additional tasks 

10.2.1 Carrying out a flue gas test 

The "Chimney Sweep" d button is used for the flue gas test. 

The heating control system works at the maximum flow 

temperature for 30 minutes. This is set on the BC10 basic 

controller using the "maximum heater temperature" knob. 

During flue gas testing the decimal point lights up in the 

display. 

• Press and hold the "Chimney Sweep" d button 

(< 5 seconds) until the decimal point is displayed. 

• Carry out the flue gas test. 

• Press the "Chimney Sweep" d button to interrupt the 

flue gas test. 

10.2.2 Selecting partial load operation (e. g. during flue 

gas testing) 

You can operate the boiler at a reduced boiler capacity 

during flue gas testing. This reduction is only effective for the 

duration of the flue gas test. 

• Press the "Chimney Sweep" d button (max. 2 seconds) 

until the decimal point shows in the status display. This 

will switch on the flue gas test. 


e buttons (for approx. 5 seconds) to enter the partial 

load mode. 

• Press the "Reset" c button to reduce the boiler capacity 

percentage. 

+ 

Example: boiler capacity reduced to 50 % of the rated boiler 

capacity. 

• Press the "Chimney Sweep" d button to increase the 

boiler capacity percentage. 

L50. 

• When test is completed, press the "Service" e button 

until the temperature indication is displayed. 


point is cleared from the display. 

10.2.3 Switching the heating system to manual mode 

In manual mode the heating system can be operated independently 

of an external control unit. The boiler is operated 

with the heating system temperature set on the right knob 

serving as the target value. 

A blinking decimal point is displayed while manual mode is 

active. 

• Press the "Chimney Sweep" d button (for more than 

5 seconds) until the decimal point in the status display 

flashes. 





• Turn the knob to set the maximum space heating system 

temperature. 

90 

110 

130 

150 

170 

190 

• Press the "Chimney Sweep" d button to exit manual 

mode. 

WARNING 

– Turn the "space heating system 

temperature" knob to limit the heating 

system temperature to the permissible flow 

temperature for the floor heating circuit (e. g. 

86 – 104 °F = 30 – 40 °C), so pipes will not 

overheat. 

DANGER 

The heating system can freeze up if a power 

failure occurs or after switching off the power 

supply, because manual operation then is no 

longer active. 

– You must re-activate manual operation after 

switching on the system to keep the heating 

system operational (especially if there is a 

risk of frost). 

Regulator 

setting 

in % 

boiler cap. 

24 kW 

Heating capacity (±5 %) 

boiler cap. 

30 kW 

boiler cap. 

45 kW 

boiler cap. 

60 kW 

kW btu kW btu kW btu kW btu 

L30 7.2 24,566 8.7 29,684 13.5 46,062 18.0 61,542 

L40 9.6 32,755 11.7 39,920 18.0 61,416 24.0 82,080 

L50 12.0 40,944 14.8 50,498 24.5 83,619 30.0 102,630 

L60 14.4 49,133 17.8 60,734 27.0 92,178 36.0 123,192 

L70 16.8 57,322 20.9 71,311 31.5 107,573 42.0 143,766 

L80 19.2 65,510 23.9 81,547 36.0 122,976 48.0 164,352 

L90 21.6 73,699 27.0 92,124 40.5 138,389 54.0 184,950 

L-- 24.0 81,888 30.0 102,360 45.0 153,810 60.0 205,560 

Table 9 

Heating capacity 

10.3 Configuring the boiler 

10.3.1 Adjusting the heating capacity 

Setting the heating capacity depending on the maximum 

heat requirement (see table 9). 


e buttons until an "L" with a double-digit value (e. g. 

L80) or an "L" followed by two dashes (L--) is displayed. 

+ 

Factory setting "L--". 

L-- 

• Set the heating capacity by pressing the "Chimney 

Sweep" d button (higher values) or the "Reset" c 

button (lower values). 

/ 

• Press the "Service" e button to confirm the setting. 




10 


10.3.2 Setting the DHW temperature value 

• Turn the "DHW temperature" rotary knob to set the 

desired temperature of the hot water in the hot-water 

tank. 

100 

90 

110 

120 

130 

140 

Condition Explanation LED 

0 Off No hot water supply (only heating mode). Off 

Eco 1 Economy mode, 

The DHW will only be reheated to 140 °F (60 °C), if the temperature has signifcantly On 2 

Hot water temperature 140 °F 

(60 °C) 

fallen. This reduces the number of burner starts and saves energy. As a result the 

water may be a bit colder initially. 

86 – 140 Direct setting on BC10 in °F The temperature set on the BC10 is a temperature that cannot be changed using a 

RC thermostat. 

On 2 

Aut 

Entry via thermostat 

(presetting) 

Table 10 Settings of "DHW temperature" knob 

1 

This function has been optimized for boilers with combined DHW heating (combi-units). 

The temperature is set on the thermostat (e. g. RC30). If no thermostat is connected, 

the maximum DHW temperature is 140 °F (60 °C). 

2 The heating program (timer) of the room control unit remains active, as a result of which no hot water is heated during night-time operation. 

3 The LED under the rotary knob lights up if the DHW temperature is below the target value (heat request for DHW). 

On 2 

10.3.3 Entering the space heating water temperature 

• Turn the "space heating water temperature" knob to set 

the upper limit value of the heater water for the heating 

operation. This limitation does not apply to DHW preparation. 

90 

110 

130 

150 

170 

190 

Condition Explanation LED 

0 Off No supply to heating system (only DHW heating operation). Off 

On 1 

86 – 190 Direct setting on BC10 in °F 

(86 – 190 °F = 30 – 90 °C) 

Aut 

Entry via thermostat 

(presetting) 

The temperature set on the BC10 is a temperature that cannot be changed using a 

RC thermostat. Supply temperature does not rise above the set temperature. 

The temperature is automatically determined on the basis of the heating 

characteristic. If no thermostat is connected, the maximum heater temperature is 

190 °F (90 °C). 

Table 11 Settings of "space heating water temperature" rotary knob 

1 The LED under the rotary knob lights up when the heating system is switched on and heat is requested. In summer mode the heating system is 

switched off (LED off). 

On 1 





10.3.4 Setting the pump post-purge period 

A pump must be connected to PK (see fig. 29, pos. 7) of the 

external connection board in order to be able to set the 

pump run over time. 


– Set the boiler primary pump post-purge 

period to 24 hours if the heating system is 

controlled by room temperature sensor and 

there is a risk of parts of the heating system 

that are outside the coverage of the room 

thermostat freezing (e. g. radiators in a 

garage; constant circulation). 


e buttons until the display shows "L--". 

• Press the "Service" e button. The display shows "F05". 

The heating system has been factory-set to a pump postpurge 

period of 5 minutes. 

• Press the "Chimney Sweep" d or "Reset" c buttons to 

set the pump post-purge period. The pump post-purge 

period can be set from 5 – 60 minutes (F 5 - F60) or to 

24 hours (F1d). 

• Press the "Service" e button to confirm the setting. 

+ 

/ 

NOTICE 

On thermostat only systems a 5 to 10 minute 

post-purge setting is recommended to purge 

heat from the boiler. 




11 

Shutting down the system 

11 Shutting down the system 

DANGER 

The heating system may freeze if it is not 

operational in times of frost. 

Protect the heating system against freezing if 

there is a danger of frost affecting the system. 

Drain the heating system water from the lowest 

point of the heating system. 

The vent screw at the highest point of the 

heating system must then be open. 

DANGER 

Should overheating occur or gas supply fail to 

shut off, turn off the manual gas control valve to 

the boiler. 

11.1 Shut down the heating system using the 

control unit 

Shut down your heating system using the BC10 basic 

controller. When the BC10 basic controller is shut down, the 

burner is also switched off automatically. Further information 

on how to operate the BC10 basic controller can be found in 

chapter 10 "BC10 basic controller", page 39. 


• Close the main shut-off valve or the gas shut-off valve. 

11.2 Shutting down the heating system in the 

event of an emergency 

You must immediately close the main shut-off valve or gas 

shut-off valve and disconnect the power from the heating 

system. 

• Close the main shut-off valve. 




Inspection 12 

12 Inspection 

We advise you to offer your customer an annual inspection 

and maintenance contract (for the contents of this contract, 

see page 59 and page 60). 

If inspection reveals that maintenance work is necessary 

you can carry this out as required (see chapter 13 "Maintenance", 

page 49). 


– Check and clean the heating system once a 

year. 

– Carry out a maintenance overhaul if 

necessary. Immediately repair defects to 

avoid damage to the heating system! 

WARNING 

Do not use this boiler if any part has been under 

water. Immediately call a qualified service technician 

to inspect the boiler and to replace any 

part of the control system and any gas control 

which has been under water. 


Risk of electric shock. 

– Before opening the system: 

disconnect the heating system from the 

power supply using the heating system 

emergency OFF button or disconnect the 

relevant circuit breaker of the house from the 

power grid. 

– Secure the heating system against 

accidental restarting. 

• Periodically examine the venting systems and cleaning 

of the screens in the vent terminal. 

• Also periodically inspect the low water cutoffs, including 

flushing of float types and clean the condensate collections 

and disposal system. 

12.1 Preparing the boiler for inspection 


• Remove the cover from the boiler (fig. 7, page 13). 

INSTRUCTION FOR THE INSTALLER 

– If gas pipes have to be disconnected from the 

gas burner fitting, the burner cover must only 

be opened by a specialized professional. 

12.2 Visual inspection for general signs of 

corrosion 

• Check all gas and water pipes for signs of corrosion. 

• Replace any pipes that are corroded. 




12 

Inspection 

12.3 Internal leak testing 


• Test for internal leaks of the gas burner fitting on the inlet 

side, applying a test pressure of 7.0 inch W.C. 

(17.4 mbar) in case of natural gas and 11.0 mbar 

(27.4 mbar) in case of LPG. 

After one minute the pressure must not have dropped by 

more than 3.8 inch W.C. (10 mbar). 

• If the pressure has dropped more, you must check all 

gaskets and joints upstream of the gas burner fitting for 

leaks using a foaming agent. Repeat the pressure test if 

no leaks are found. If the pressure has again dropped by 

more than 3.8 inch W.C. (10 mbar) per minute you will 

have to replace the gas burner fitting. 

12.4 Measuring the ionization current 

See subsection 9.12 "Measuring the ionization current", 

page 37. 

12.5 Measuring the inlet gas pressure 

See subsection 9.7 "Inlet gas pressure", page 33. 

12.6 Checking and adjusting the gas/air ratio 

See subsection 9.8 "Checking and adjusting the gas/air 

ratio", page 34. 

12.7 Carrying out a gas leak test in operating 

conditions 

See subsection 9.9 "Carrying out a leak test in operating 

conditions", page 36. 

12.8 Measuring the carbon monoxide content 

(CO) 

See subsection 9.10 "Measuring the carbon monoxide 

content (CO)", page 36. 

12.9 Carrying out a pressure test of the 

heating system 

See chapter 9 "Start-up procedure", page 30. 

12.10 Checking the functioning and the safety 

of the air intake and flue gas conduit 

See subsection 9.5 "Checking the combustion air/flue gas 

connection", page 32. 

12.11 Checking venting systems 

Check air intake and flue gas for obstruction or damage. 




Maintenance 13 

13 Maintenance 


There is no need to lubricate the combustion 

motor as it is permanently lubricated. 


• Close the gas shut-off valve. 

• Remove the casing. 

13.1 Cleaning the heat exchanger, burner 

and condensate trap 


To avoid a short circuit. 

– Do not spray the cleaning agent onto the 

burner, the hot surface ignitor, the ionization 

electrode or other electric components. 

• Dismantle the hot surface ignitor and the ionization electrode. 

• Loosen the fastening nuts (fig. 43, pos. 1). 

• Remove the earth cable (fig. 43, pos. 2). 

• Remove the retaining plate. 

• Pull the hot surface ignitor (fig. 43, pos. 3) and the ionization 

electrode (fig. 43, pos. 4) out of the heat exchanger. 

• Loosen the threaded connection to the gas control valve 

(fig. 44, pos. 1) and pull the plug (fig. 44, pos. 2) from the 

gas valve terminal block. 

• Pull the plug from the fan unit (fig. 44, pos. 3). 

Fig. 43 

5 

4 

Removing the hot surface ignitor and the ionization 

electrode 

5 

4 

1 

3 

2 

Fig. 44 

Removing the connections 




13 

Maintenance 

• Loosen both sets of retaining clips (fig. 44, pos. 4 and 5) 

of the burner cover and remove the burner cover with the 

fan unit and the gas burner fitting (fig. 45, pos. 1). 

• Remove the gas/air distributor plate (fig. 45, pos. 2), the 

orifice plate (GB142-24, GB142-30 and GB142-60 only, 

fig. 45, pos. 3) and the burner (fig. 45, pos. 4). Note that 

the orifice plate of the GB142-60 has a different shape. 

• Clean the gas/air distributor plate, the orifice plate 

(GB142-24, GB142-30 and GB142-60 only) and the 

burner using compressed air. 

1 

2 

3 

4 

• Remove the baffle plate and clean it using compressed 

air (fig. 46). 

Fig. 45 

Cleaning the burner cover, gas/air distributor plate, 

orifice plate and burner 

• Flush the heat exchanger with water. 

• Re-assemble all parts in reverse order of disassembly. 

NOTICE 

It is important to inspect and properly replace 

the rubber gaskets. 

Fig. 46 

1 

Baffle plate 


Fig. 47 

Cleaning the heat exchanger 


point is displayed. Leave the boiler on for approx. 

10 minutes. 




Maintenance 13 


• Dismantle the boiler again and flush the heat exchanger 

with water. 

• Pull the condensate trap from the condensate plate 

(fig. 48, pos. 1). 

• Loosen the condensate trap from the connection (fig. 48, 

pos. 2) and remove it. 

• Use a bristle brush to clean the condensate trap. 

• Flush the condensate trap. 

• Fill the condensate trap with water before re-installing it. 

• Check the condensate trap gasket for damage and 

replace it if necessary. 


1 

2 

Fig. 48 

Condensate trap 

13.2 Checking and adjusting the gas/air-ratio 

See chapter 9.8 "Checking and adjusting the gas/air ratio", 

page 34. 




14 

Converting the boiler to propane 

14 Converting the boiler to propane 

To convert the boiler to propane, the following instructions 

must be adhered to: 

DANGER 

if flammable gas explodes. 

Only carry out work on gas conduits and fittings 

if you are licensed for such work. 

• Turn off the gas supply. 


• Disconnect the electrical power to the boiler. 

• Set the thermostat or other operating control to lowest 

setting. 

• Remove the casing (fig. 49). 

GB142-24/30 

GB142-45/60 

Fig. 49 

Remove the casing 

• Loosen the screw connection on the gas valve (fig. 44, 

pos. 1, page 49) and pull the plug (fig. 44, pos. 2, 

page 49) from the gas valve. 

• Pull both plugs from the fan unit (fig. 44, pos. 3, 

page 49). 

• Loosen both retaining clips (fig. 44, pos. 4, page 49) on 

the burner cover and remove the burner cover together 

with the fan unit and the gas valve. 

• Loosen the three crosshead screws and remove the gas 

valve from the fan unit (fig. 50, pos. 1). 

• Remove the gas orifice (fig. 50, pos. 2). 

1 

2 

Fig. 50 

Replacing the gas orifice 




Converting the boiler to propane 14 

• Fit the right orifice for the new type of gas supply (see 

table 12). Make sure not to damage the O-rings. 


• Carry out the start-up activities and complete a new startup 

report. 

• Also check all joints and gaskets affected by the installation 

activities while carrying out the tightness test in operating 

conditions. 

• Place a new sticker underneath the existing rating plate 

sticker indicating the type of gas supply installed. Fill out 

the required information on the conversion label. 

• Fit the casing again. 

Boiler 

capacity 

Type of 

gas supply 


in mm (inch) 

24 kW Natural gas 4.45 (0.174) 

LPG P 3.35 (0.131) 

30 kW Natural gas 4.45 (0.174) 

LPG P 3.35 (0.131) 

45 kW Natural gas 5.40 (0.213) 

LPG P 4.05 (0.158) 

60 kW Natural gas 7.50 (0.293) 

LPG P 5.40 (0.213) 

Table 12 Gas orifice diameter 




15 

Appendix 

15 Appendix 

15.1 Operating messages 

• Press the "Service" e button a number of times to switch 

between the various status displays. 

Display 

Meaning 

Normal mode 

=/- 

[-/h/\| Boiler in space heating mode * 

[=/h/\| 

Boiler in DHW heating mode 

Normal mode 

0 

[0/a/\| 

[0/c/\| 

[0/e/\| 

[0/h.\| 

[0/l/\| 

[0/u/\| 

[0/y/\| 

Test mode - 

[-/a.\| 

Manual mode - 

[-/h.} 

Reset 

Dot displayed in righthand 

bottom corner 

Blinking dot in righthand 

bottom corner 

Burner interval circuit, burner will start automatically after 10 minutes 

Burner is started 

More capacity was delivered than required 

Standby 

Gas burner fitting is opened 

Initializing/ pre purge 

Flow temperature higher than set 

Boiler in flue gas test 

Boiler in manual mode 

[r/e/\| Reset (after holding the "Reset" c button for 5 seconds, the heating system is returned to its 

switch-on condition) 

Table 13 Normal operating messages 

* “- H” May also appear when the boiler is in frost protection mode. There has been a continuous DHW demand and CH request for more then one hour. 

The boiler then switches to CH mode. The operating code flashing in the display after the service button is pressed is A01/ 818. 

To enable the DHW, restart the boiler. 




Appendix 15 

15.2 Error messages 

• Press the "Service" e button to display the service code 

(e. g. "3A"). 

• Press the "Service" e button to display the error code 

(e. g. "207"). 

The error message is a combination of the service code 

(e. g. "3A") and the error code (e. g. "207"). You can only 

resolve the error message using the Service chapter in this 

manual. 

INSTRUCTION FOR INSTALLERS 

The display may also show system faults (e. g. 

"A11"). In principle, they are identified by the 

initial letter "A" and they refer to faults between 

the boiler and the additionally available electronic 

components. 

Display Meaning 

2 Water flow / water pressure 

E 207 System pressure too low < 3 psi (0.2 bar). 

F 271 Temperature difference between safety and supply 

sensors too much or no temperature increase after 

starting the burner. 

L 266 Test of pump operation via a pressure increase in the 

heating system (during pump start). 

P Temperature increase of safety sensor or supply 

sensor too high. 

U Temperature difference between supply and return 

sensor too much. 

Y Pump feedback fault. 

3 Fan speed 

A 264 Fan unit failed during operation. 

F 273 Continuous 24 hour operation. 

L 214 Fan shut down during security test. 

P 216 Fan unit is running too slowly. 

Y 215 Fan unit is running too fast. 

4 Temperatures 

A 218 Supply sensor over 220 °F (105 °C). 

E 278 Sensor test failed 

L 220 Safety sensor affected by short circuit or higher than 

266 °F (130 °C). 

P 221 Loose contact or defective safety sensor. 

U 222 Supply sensor affected by short circuit. 

Y 223 Loose contact or faulty supply sensor. 

Display Meaning 

6 Flame monitoring 

A 227 No ionization message after ignition. 

C 228 Ionization measured before burner start. 

306 

L 306 The flame went out during the heating phase. 

P 229 Hot-surface ignitor on for too long. 

7 Grid voltage 

C 231 The grid power was interrupted after an error. 

L 261 UBA fault. 

280 

8 External switching contact 

Y External switching contact, e. g. temperature 

safety switch for floor heating, has taken place. 

9 System faults 

A 235 Communication fault between UBA and KIM. 

H 237 UBA fault. 

267 

272 

P 239 UBA fault. 

L 234 Faulty gas burner fitting cable connection. 

238 

239 

U 233 KIM out of order. 

Y Communication fault between BC10 basic 

controller and UBA. 

E System faults 

1, A, C, Internal UBA fault. 

F, H, L, 

Y 




15 

Appendix 

15.3 Technical specifications 

General specifications Unit boiler cap. 

24 kW 

boiler cap. 

30 kW 

boiler cap. 

45 kW 

boiler cap. 

60 kW 

Gas category Natural gas Natural gas Natural gas Natural gas 

Rated thermal load for Natural gas btu/hr 25,700 – 84,800 31,800 – 106,000 46,000 – 149,000 66,000 – 214,800 

Rated heating capacity for heating curve 176/140 °F 

btu/hr 22,700 – 75,200 28,100 – 91,500 40,600 – 131,500 58,200 – 189,800 

(80 – 60 °C) 

Rated heating capacity for heating curve 122/86 °F btu/hr 25,300 – 83,300 30,700 – 102,400 45,100 – 146,300 64.800 – 211,600 

(50 – 30 °C) 

Boiler efficiency rating max. capacity for heating curve 

% 88 88 88 88 

176/140 °F (80 – 60 °C) 

Boiler efficiency rating max. capacity for heating curve 

% 97 97 97 97 

122/86 °F (50 – 30 °C) 

CSA output btu/hr 76,300 95,400 144,800 178,900 

Heating 

Max. flow temperature °F (°C) 194 (90) 194 (90) 194 (90) 194 (90) 

Heater water temperature °F (°C) 86 – 190 (30 – 

90), can be set on 

BC10 basic 

controller 

86 – 190 (30 – 



86 – 190 (30 – 


BC10 basic 

controller 

86 – 190 (30 – 


BC10 basic 

controller 

Max. operating overpressure of boiler psi (bar) 43.5 (3) 43.5 (3) 58 (4) 58 (4) 

Heat exchanger heating circuit volume gallons (l) 0.7 (2.5) 0.7 (2.5) 1.0 (3.6) 1.3 (4.7) 

Pipe connections 

Gas connection inch ¾” NPT ¾” NPT ¾” NPT ¾” NPT 

Heating system water connection inch (mm) 1.0” NPT (25.4) 1.0” NPT (25.4) 1.0” NPT (25.4) 1.0” NPT (25.4) 

Condensate water connection inch (mm) Ø 1.3” (Ø 32) Ø 1.3” (Ø 32) Ø 1.3” (Ø 32) Ø 1.3” (Ø 32) 

Flue gas values 

Condensate water quantity for natural gas G20, 104/86 °F gallons 2.6 3.3 4.7 7.1 

(40/30 °C) 

per hour 

pH value condensate water pH approx. 4.1 approx. 4.1 approx. 4.1 approx. 4.1 

Flue gas mass flow rate at full load g/s 10.0 12.6 19.4 25.9 

Flue gas temperature 176/140 °F (80/60 °C), full load °F (°C) 150 (66) 167 (75) 150 (66) 150 (66) 

Flue gas temperature 176/140 °F (80/60 °C), partial load °F (°C) 135 (57) 137 (58) 135 (57) 135 (57) 

Flue gas temperature 122/86 °F (50/30 °C), full load °F (°C) 113 (45) 118 (48) 96 (36) 96 (36) 

Flue gas temperature 122/86 °F (50/30 °C), partial load °F (°C) 91 (33) 91 (33) 91 (33) 91 (33) 

CO 2 content, full load, natural gas G20 % 9.2 9.2 9.3 9.3 

CO 2 content, full load, LPG G31, propane % 10.0 10.0 10.0 10.0 

Standard emission factor CO mg/kWh ≤ 15 ≤ 15 1 ≤ 15 ≤ 15 

Standard emissions factor NO x mg/kWh ≤ 20 ≤ 20 1 ≤ 20 ≤ 20 

Free fan unit feed pressure 

inch W.C. 

(Pa) 

up to 0.023 

(up to 60) 

up to 0.039 

(up to 100) 

up to 0.054 

(up to 140) 

up to 0.054 

(up to 140) 

Flue gas connection 

Ø Flue system, dependent on the air in the room inch (mm) 3 (80) 3 (80) 3 (80) 3 (80) 

Ø Flue system, independent of the air in the room inch (mm) 3/3 (80/80) 

parallel 

Electric data 

3/3 (80/80) 

parallel 

3/3 (80/80) 

parallel 

3/3 (80/80) 

parallel 

main voltage V, Hz 120, 60 120, 60 120, 60 120, 60 

Fuses amps 5 amps 120V 

slow blow 

5 amps 120V 

slow blow 

5 amps 120V 

slow blow 

5 amps 120V 

slow blow 

Electrical protection rating IP X4D IP X4D IP X4D IP X4D 

Electrical power consumption, at full load W 96 117 64 82 

Electrical power consumption, at partial load W 22 22 20 22 

Table 14 Technical specifications 

1 If the heating capacity is limited to max. 80% (L80). 




Appendix 15 

General specifications Unit boiler cap. 

24 kW 

Boiler dimensions and weight 

Height × Width × Depth 

inch 

(mm) 

28 × 22 × 18.7 

(712 x 560 x 475) 

boiler cap. 

30 kW 

28 × 22 × 18.7 

(712 x 560 x 475) 

boiler cap. 

45 kW 

28 × 35.4 × 18.7 

(712 x 900 x 475) 

boiler cap. 

60 kW 

28 × 35.4 × 18.7 

(712 x 900 x 475) 

Weight lbs (kg) 110 (50) 110 (50) 143 (65) 158 (72) 

Table 14 Technical specifications 

1 

If the heating capacity is limited to max. 80% (L80). 

Type of gas 

supply 

Factory pre-setting of the gas control valve 

Natural gas Delivered factory-set: Natural Gas 

LPG P Suitable for propane after conversion (also see 

the chapter "Conversion to another type of gas 

supply"). 

Information on gas type instruction plate: 

Set to gas category: Propane. 

Table 15 Factory setting of the gas control valve 

Thermal 

power gas 

boiler 

Type of gas 

supply 

Gas orifice 

diameter in mm 

(inch) 

Venturi article 

number 

1 

GB142-24 



Natural gas 4.45 (0.174) 423.072A 

LPG P 3.35 (0.131) 423.072A 

Natural gas 4.45 (0.174) 423.072A 

LPG P 3.35 (0.131) 423.072A 

Natural gas 5.40 (0.213) 423.170A 

LPG P 4.05 (0.158) 423.170A 


Table 16 Gas orifice diameter 

Natural gas 7.50 (0.293) 423.173A 

LPG P 5.40 (0.213) 423.173A 

• The gas orifice diameter is marked on the gas orifice 

(in mm). 

• The venturi article number is marked on both clips of the 

venturi (see fig. 51, pos. 1 and 2). 

Fig. 51 

2 

Venturi article number 




16 

Reports 

16 Reports 

16.1 Start-up report 

Put your signature and the date at the bottom of the start-up 

report. 

Start-up activities Page Measured values Remarks 

1. Fill the heating system and check that all connections are tight 

– Inlet pressure of expansion tank (observe the Installation Instructions 

for the expansion tank) 

– Pressurize the system 

– Fill the condensate trap 

30 

30 

30 

30 

__________ psi 

__________ psi 

2. Carry out a gas tightness test 30 

3. Note down the gas characteristics: Wobbe index 

Operating heat value 

30 __________ kWh/m³ 

__________ kWh/m³ 

4. Convert the boiler to another type of gas supply (only if allowed) 52 

5. Vent the gas supply conduit 32 

6. Check the combustion air/flue gas connection 32 

7. Measure the gas connection pressure (flow pressure) 33 ________ inch W.C. 

8. Check and adjust the gas/air ratio 34 ________ inch W.C. 

9. Measure the carbon monoxide content (CO) 36 __________ ppm 

10. Check and if necessary adjust the carbon monoxide content (CO 2 ) __________ % 

11. Measuring the ionization current 37 __________ µA 

12. Make the necessary settings on the thermostat 39 

13. Carry out function testing 36 

14. Fitting the casing 38 

15. Inform the owner; hand over the technical documents 38 

Confirm proper start-up 

Company stamp/signature/date 




Reports 16 

16.2 Inspection report 

• Please indicate the inspection activities that you have 

carried out and enter the values measured. 

Inspection activities page Date: ______ Date: ______ Date: ______ 

1. Test the general condition of the heating system 

2. Carry out a visual inspection and test the functions of the 

heating system 

3. Test all gas and water conduits and fittings for: 

– their tightness during operation 

– visible corrosion 

– signs of aging 

– fill the condensate trap 

4. Check the burner, the heat exchanger and the condensate trap for 

pollution. First shut down the heating system 

5. Check the burner and the ignition and ionization electrodes. 

First shut down the heating system 

48 

47 

32 

49 

49 

6. Measure the ionization current 37 _______ µA _______ µA _______ µA 

7. Measure the gas connection pressure (flow pressure) 33 _______ psi _______ psi _______ psi 

8. Check the gas/air ratio 34 _____ inch W.C. _____ inch W.C. _____ inch W.C. 

9. Carry out a gas tightness test in operating conditions 48 

10. Measure the carbon monoxide content (CO) 48 _______ ppm _______ ppm _______ ppm 

11. Check the water pressure of the heating system 

– Inlet pressure of expansion tank (also see the 

Installation Instructions for the expansion tank) 

– Filling pressure 

30 

30 

_______ 

_______ psi 

_______ psi 

12. Check the operation and safety of the air intake and flue pipe 32 

13. Check that the thermostat is set in line with the needs 

(see documents with thermostat) 

39 

14. Final check of inspection activities, note down the measurement 

and test results 

15. Confirm proper inspection 

Company 

stamp/signature 

Company 


Company 





16 

Reports 

16.3 Maintenance report 

• Sign for the maintenance activities that you have carried 

out and enter the date. 

Needs-dependent maintenance activities Page Date: _____________ Date: _____________ 

1. Clean the burner, the heat exchanger and the condensate trap. 

First shut down the heating system 

2. Check and adjust the gas/air ratio 

CO 2 content with full load 

CO 2 content with partial load 

49 

34 _____________ inch W.C. 

_______________ % 

_______________ % 

_____________ inch W.C. 

_______________ % 

_______________ % 

3. Confirm proper maintenance 

Company stamp/ 

Signature 

Company stamp/ 

Signature 




17 Spare parts 

Spare parts 17 

Below is a list of the spare parts for this boiler. Look up the position number in the exploded view drawing on the next two 

pages for the illustration. Spare parts may be ordered from Buderus. 

Pos. Description Product No. 

1 

Casing 24/30 kW 7099988 

Casing 45/60 kW 7099901 

2 Casing latches left (2 pc) 7099039 

3 Casing latches right (2 pc) 7099038 

4 

Casing seal 24/30 kW 7098752 

Casing seal 45/60 kW 7098798 

5 Wall mounting bracket 7098364 

6 

Back panel 24/30 kW 7099001 

Back panel 45/60 kW 7099903 

7 Cap air vent 7100250 

8 Exhaust adapter 3” – 3” 28268 

9 Seal ring Ø 3” 77470s 

10 Seal ring Ø 80 mm 7096475 

11 Flue gas collector 7098857 

12 Oval seal 7098858 

Heat exchanger 24/30 kW 7746900159 

13 Heat exchanger 45 kW 7746900160 

Heat exchanger 60 kW 7746900161 

14 Heat exchanger baffle 24/30 kW 7098828 

Seal condensate collector 24/30 kW 7098834 

15 Seal condensate collector 45 kW 7098838 

Seal condensate collector 60 kW 67900522 

Condensate collector + sealing 24/30 kW 7098840 

16 Condensate collector + sealing 45 kW 7098844 

Condensate collector + sealing 60 kW 67900521 

17 Clamp 7098848 

18 Sensor NTC 7100136 

19 Revision set air vent ** 7098822 

20 Sight glass 7098575 

Burner box 24/30 kW 7099057 

21 Burner box 45 kW 7098875 

Burner box 60 kW 67900525 

22 Safety sensor 78194 

Seal burner 24/30 kW 7098916 

23 Seal burner 45 kW 7098920 

Seal burner 60 kW 67900526 

Gas/air distribution plate 24/30 kW 7100922 

24 Gas/air distribution plate 45 kW 7098926 

Gas/air distribution plate 60 kW 67900527 

25 

Orifice plate 24/30 kW 7100920 

Orifice plate 60 kW 7746700120 

Burner 24/30 kW 7099003 

26 Burner 45 kW 7098932 

Burner 60 kW 67900528 

27 Gas-air inlet 7099004 

28 Seal fan 7099023 

29 Ionization electrode 78195 

30 Hot surface ignitor 7099006 

31 Shield hot surface ignitor 7100229 

32 Mounting plate 7098852 

33 Seal mounting plate (5 pc) 7098850 


34 

Air inlet pipe; 24/30 kW 7099024 

Air inlet pipe; 45/60 kW 7099023 

35 Seal Ø50 mm (5 pc) 7099058 

Venturi 24/30 kW 7099020 

36 Venturi 45 kW 7099925 

Venturi 60 kW 7099931 

37 Seal set (4 pc) 7099021 

38 Fan 78184 

39 Gas control valve 7099025 

40 Gas supply pipe GB142 USA 76685 

41 Spring (5 pc) 7100549 

42 Seal 2x16x22 (5 pc) 7098778 

Orifice Ø 4.45 24/30 kW 7099016 

43 Orifice Ø 5.40 45 kW 76690 

Orifice Ø 7.50 60 kW 76686 

44 Condensate trap 75978 

45 Seal condensate trap (5 pc) 7100742 

47 

Supply pipe CH; 24/30/45 kW 75990 

Supply pipe CH; 60 kW 75991 

48 

Return pipe 24/30/45 kW 709965 

Return pipe 60 kW 709945 

49 Pressure sensor ** 7101436 

50 Bottom plate 7099049 

51 Transformer 120V 78191 

52 Grommet 7099050 

53 External connection board 7099042 

54 External connection board cover 7099046 

55 Fuse 5 AF slow blow 73904s 

56 UBA cover 7099047 

57 UBA3 - 120V 7099707 

58 Drawer 7099043 

59 Drawer front 7099037 

60 Controller connection plate 78186 

61 On/off switch 7099041 

62 Controller cover 73698 

Boiler ident. module 24 kW 78223 

63 




64 Cable harness low voltage 78193 

65 Cable harness high voltage 7099957 

66 O-ring (10 pc) 38434s 

67 Sealing bush (set) 7099002 

68 Cable harness of on/off switch 7099072 

69 Cable harness BX holder 7099070 

70 Fuse holder 38345 

71 Seal Ø60 mm (5 pc) 7098878 

72 O-ring set orifice 7099018 

73 Seal (5 pc) 7099059 

74 Set screw M5x20 (5 pc) 7099065 

** not shown in exploded views 




17 

Spare parts 


75 Cap 24/30 kW 79105 

76 Double nipple THR x COMPR 75977 

77 Cabel saddle (10 pc) 7098810 

78 Bolt M6x16 (2 pc) 7099078 

79 Clip pressure sensor 7101370 

80 Drainplug 7099364 

81 Cap connection piece 38498 

82 Clip (5 pc) 73651s 

83 Centering ring (5 pc) 73480s 

84 Coupling nut pump 73481s 

85 Seal pump (10 pc) 15022s 

86 Coupling nut pump 15020 

87 Conversion set pump 73149 

*** Conversion kit propane 24/30 kW 76687 

*** Conversion kit propane 45 kW 76688 

*** Conversion kit propane 60 kW 7746900156 




Spare parts 17 

Exploded view Logamax plus GB142-24/30 

71 

21 

29 

19 

10 

74 

17 

32 

33 

11 

23 

27 

22 

31 

24 

28 

25 30 

74 

26 

15 

14 

66 

13 

66 

12 

20 

9 

8 

34 

40 

35 

36 37 

74 

17 

16 

45 

38 

44 

18 

83 

87 

84 

85 

85 

86 

48 

7 

5 

41 

42 

73 

72 43 

39 

81 

79 

80 

82 

47 

76 

67 

6 

4 

49 

76 

75 

77 

2 

78 

64 

3 

65 

54 

69 

1 

61 

60 

62 

57 

63 

70 

55 

56 

53 

52 

51 

68 

59 

50 

58 




17 

Spare parts 

Exploded view Logamax plus GB142-45/60 

71 

21 

29 

19 

10 

27 

28 

74 

74 

17 

23 

24 

25 

26 

32 

33 

31 

22 

30 

14 

66 

11 

13 

12 

20 

9 

8 

15 

66 

7 

34 

17 

16 

45 

18 

87 

83 

84 

85 

5 

40 

41 

42 

35 

36 

74 

72 

73 

43 

39 

37 

44 

4 

38 

81 

49 

79 

80 

82 

85 

86 

47 

48 

77 

67 

67 

6 

2 

78 

3 

64 

54 

65 

1 

61 

62 

57 

63 

70 

55 

56 

53 

52 

69 

60 

51 

68 

59 

50 

58 




Index 18 

18 Index 

B 

Baffle plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 

BC10 basic controller . . . . . . . . . . . . . . . . . . . . . . 8, 39 

Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 

C 

Carbon monoxide content . . . . . . . . . . . . . . . . . . . . . 36 

Casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 

CO values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 

Combustion air/flue gas connection . . . . . . . . . . . . . 32 

Condensate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 

Condensate trap . . . . . . . . . . . . . . . . . . . . . . . . . 49, 51 

Condensate water drain . . . . . . . . . . . . . . . . . . . . . . 26 

Connection 120 volts . . . . . . . . . . . . . . . . . . . . . . . . 28 

Connections (for gas, flue gas and water) . . . . . . 9, 10 

D 

DHW recirculating pump . . . . . . . . . . . . . . . . . . . . . . 27 

DHW tank pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 

DHW temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9, 10 

Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 

E 

Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 

Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 

F 

Fan unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 

Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 

Flue gas test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 

Frost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12, 46 

Function testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 

G 

Gas leak tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 

Gas nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 

Gas supply conduit . . . . . . . . . . . . . . . . . . . . . . . . . . 32 

Gas supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . 33 

Gas/air distributor plate . . . . . . . . . . . . . . . . . . . . . . . 50 

Gas/air ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 

H 

Heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . 49, 56 

Heating system water . . . . . . . . . . . . . . . . . . . . . . . . 46 

Hot-water target value . . . . . . . . . . . . . . . . . . . . . . . . 44 

I 

Inspection report . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 

Installation room . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 

Internal leak testing . . . . . . . . . . . . . . . . . . . . . . . . . .48 

Ionization current . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 

Items supplied with unit . . . . . . . . . . . . . . . . . . . . . . .11 

M 

Mains connection . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 

Maintenance report . . . . . . . . . . . . . . . . . . . . . . . . . .60 

Manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 

O 

Operating messages . . . . . . . . . . . . . . . . . . . . . . . . .54 

Orifice plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 

Outdoor-temperature sensor . . . . . . . . . . . . . . . . . . .27 

P 

Part-load operation . . . . . . . . . . . . . . . . . . . . . . . . . .42 

Primary loop pump . . . . . . . . . . . . . . . . . . . . . . . . . .27 

Pump slowing-down period . . . . . . . . . . . . . . . . . . . .45 

R 

Resetting the burner . . . . . . . . . . . . . . . . . . . . . 39, 40 

S 

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 

Service codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 

Signs of corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . .47 

Space heating water temperature . . . . . . . . . . . . . . .44 

Start-up report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 

Switching contact, external . . . . . . . . . . . . . . . . . . . .27 

Switching on the heating system . . . . . . . . . . . . . . . .39 

T 

Technical specifications . . . . . . . . . . . . . . . . . . . . . . .56 

Tightness test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 

Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 

Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 

V 

Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 




Notes 



66 Installation Instructions Logamax plus GB142-24/30/45/60 • version 10/2007

Notes 




Heating Contractor: 

PRODUCTS MANUACTURED BY 

BBT Thermotechnik GmbH 

35573 W 

www.buderus.de 

Bosch Thermotechnology Corp. 

50 Wentworth Avenue 

Londonderry, NH 03053 

Tel: 603-552-1 

www.buderus.net 

721.502A – 4848 – 10/2007 

Bosch Thermotechnology Corporation reserves the right to make changes without notice 

due to continuing engineering and technological advances.

Installation instructions GB142 - USA/CA - Buderus

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